I build much of my navigation by using the web.sitemap file. After upgrading my site to ASP.net 4.0 and IIS7, I'm seeing lots of errors related to the 'Sitemap.CurrentNode' property. Specifically, the CurrentNode is coming up null, when I know that the node exists in the web.sitemap file. Actually, trying to find any node in the web.sitemap file seems to be failing.

As an example, this page throws the exception, but you can see in web.sitemap file below that the node listed in the exception does in fact exist.

I am getting this error on what appears to be all pages which use the Sitemap.CurrentNode property on the web.sitemap file. Strangely, building my website sitemap using web.sitemap works just fine.

On my local machine using VS2010 everything works as expected.

Code ASP:
<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
 
	<siteMapNode url="~/default.aspx" title="Fantasy Football and Racing Cheat Sheets"  description="Create customized fantasy draft cheat sheets for various fantasy sports including NFL football and NASCAR racing, or free.">
 
    <siteMapNode url="~/register.aspx" title="Register"  description="Register to unlock the full power of CheatSheetWarRoom." />
    <siteMapNode url="~/sitemap.aspx" title="Sitemap" description="View all pages of our website provided as hyperlinks for easy navigation." />
		<siteMapNode url="~/faq.aspx" title="FAQ" description="Get answers to frequently asked questions." />
		<siteMapNode url="~/about.aspx" title="About" description="Read about what drove the creation of our cheat sheet creation tools." />
		<siteMapNode url="~/contact.aspx" title="Contact"  description="Contact us with any queries or suggestions you may have." />
		<siteMapNode url="~/passwordrecovery.aspx" title="Password Recovery"  description="If you've forgot your password, validate yourself and we'll sent it to you." />
		<siteMapNode url="~/editprofile.aspx" title="Edit Profile" description="Edit your personal profile to keep your personal information current." />
		<siteMapNode url="~/admin/Users/UserStats.aspx?" title="Admin" roles="Administrator" description="An entry point into the administration menu." />
 
    <!-- **************** -->
    <!-- Fantasy Football -->
    <!-- **************** -->
 
    <siteMapNode url="/FantasyFootball" title="Fantasy Football" description="These pages are relevant to fantasy football." roles="*" link="false">
 
      <!--Fantasy Football Landing Page-->
      <siteMapNode url="~/fantasy-football/nfl/cheat-sheets.aspx" title="Fantasy Football Cheat Sheets" description="Prepare for your 2010 NFL fantasy football draft by creating customized fantasy football cheat sheets, for free."></siteMapNode>
      <siteMapNode url="~/fantasy-football/nfl/cheat-sheet-help.aspx" title="Football Cheat Sheet Help" description="Explore all features for creating fantasy football cheat sheets."/>
 
      <!--Fantasy Football Cheat Sheet Creation-->
			<siteMapNode  url="/FantasyFootballCreateSheetCreation" title="Fantasy Football Cheat Sheet Creation" description="The creation of cheat sheets." roles="*" link="false">
				<siteMapNode url="~/fantasy-football/nfl/create/custom-sheet.aspx" title="Custom Fantasy Football Cheat Sheet" description="Use this free, custom fantasy football cheat sheet to easily create your NFL fantasy player rankings using drag and drop."></siteMapNode>
        <siteMapNode url="~/fantasy-football/nfl/create/editsheet.aspx" title="Edit Fantasy Football Cheat Sheet"></siteMapNode>
        <siteMapNode url="~/fantasy-football/nfl/create/newsheet.aspx" title="New Fantasy Football Cheat Sheet"></siteMapNode>
        <siteMapNode url="~/fantasy-football/nfl/create/managesheets.aspx" title="Manage Fantasy Football Cheat Sheet"></siteMapNode>
        <siteMapNode url="~/fantasy-football/nfl/create/configureprint.aspx" title="Configure Printable Fantasy Football Cheat Sheet" roles="Member, SupplementalSource, Administrator"></siteMapNode>
      </siteMapNode>  <!-- Close Fantasy Football Cheat Sheet Creation -->
 
      <!-- Fantasy Football Free -->
      <siteMapNode url="/FantasyFootballFree" title="Free Fantasy Football Resources" roles="*" link="false">
 
 
        <!-- Fantasy Football (Offensive) Player Rankings-->
        <siteMapNode url="~/fantasy-football/nfl/free/rankings/player-rankings.aspx" roles="*" title="2010 NFL Player Rankings">
          <siteMapNode url="/FantasyFootballFreeRankingsOffense" title="Offensive Positions" link="false"  roles="*">
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/quarterbacks.aspx" title="Quarterback Rankings" description="View our free quarterback rankings in preparation for your 2010 fantasy football draft." />
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/running-backs.aspx" title="Running Back Rankings" description="View our free running back rankings in preparation for your 2010 fantasy football draft." />
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/wide-receivers.aspx" title="Wide Receiver Rankings" description="View our free wide receiver rankings in preparation for your 2010 fantasy football draft." />
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/tight-ends.aspx" title="Tight End Rankings" description="View our free tight end rankings in preparation for your 2010 fantasy football draft." />
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/kickers.aspx" title="Kicker Rankings" description="View our free kicker rankings in preparation for your 2010 fantasy football draft." />
            <siteMapNode url="~/fantasy-football/nfl/free/rankings/offense/defenses.aspx" title="Defense Rankings" description="View our free defense rankings in preparation for your 2010 fantasy football draft." />
          </siteMapNode>
        </siteMapNode>  <!-- Close Fantasy Football Player Rankings -->
 
        <!-- Printable Fantasy Football Cheat Sheets-->
        <siteMapNode url="~/fantasy-football/nfl/free/printable/cheat-sheets.aspx" title="Printable Fantasy Football Cheat Sheets" roles="*">
          <siteMapNode url="/FantasyFootballFreePrintableCheatSheetsOffense" title="Offensive Positions" link="false"  roles="*">
            <!--All-in-One-->
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/cheat-sheet-with-roster.aspx" title="Printable Fantasy Football Cheat Sheet With Roster" roles="*"/>
            <!--By Position-->
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/quarterbacks-cheat-sheet.aspx" title="Printable Quarterbacks Cheat Sheet" roles="*"/>
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/running-backs-cheat-sheet.aspx" title="Printable Running Backs Cheat Sheet" roles="*"/>
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/wide-receivers-cheat-sheet.aspx" title="Printable Wide Receivers Cheat Sheet" roles="*"/>
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/tight-ends-cheat-sheet.aspx" title="Printable Tight Ends Cheat Sheet" roles="*"/>
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/kickers-cheat-sheet.aspx" title="Printable Kickers Cheat Sheet" roles="*"/>
            <siteMapNode url="~/fantasy-football/nfl/free/printable/offense/defenses-cheat-sheet.aspx" title="Printable Defenses Cheat Sheet" roles="*"/>
          </siteMapNode> <!-- Close Printable Fantasy Football Cheat Sheets OFFENSE -->
        </siteMapNode>  <!-- Close Printable Fantasy Football Cheat Sheets-->
 
        <!-- Fantasy Football Links -->
        <siteMapNode url="~/fantasy-football/nfl/free/links.aspx" title="Fantasy Football Links"  description="This page contains links to various fantasy NFL football websites categorized by type." />
 
      </siteMapNode>  <!-- Close Printable Fantasy Football Free -->
 
	  </siteMapNode>  <!-- Close Fantasy Football -->
 
    <!-- ************** -->
    <!-- Fantasy Racing -->
    <!-- ************** -->
    <siteMapNode url="/FantasyRacing" title="Fantasy Racing" description="These pages are relevant to fantasy racing." roles="*" link="false">
 
      <!-- Fantasy Racing Landing Page -->
      <siteMapNode url="~/fantasy-racing/nascar/cheat-sheets.aspx" title="Fantasy Racing Cheat Sheets" description="Prepare for your 2010 NASCAR fantasy racing draft by creating customized fantasy racing cheat sheets, for free."></siteMapNode>
      <siteMapNode url="~/fantasy-racing/nascar/cheat-sheet-help.aspx" title="Racing Cheat Sheet Help" description="Explore all features for creating fantasy racing cheat sheets."/>
      <!-- Fantasy Racing Cheat Sheet Creation -->
      <siteMapNode url="/FantasyRacingCreateSheetCreation" title="Fantasy Racing Cheat Sheet Creation" description="The creation of cheat sheets." roles="*" link="false">
        <siteMapNode url="~/fantasy-racing/nascar/create/custom-sheet.aspx" title="Custom Fantasy Racing Cheat Sheet" description="Use this free, custom fantasy racing cheat sheet to easily create your fantasy NASCAR driver rankings using drag and drop."></siteMapNode>
        <siteMapNode url="~/fantasy-racing/nascar/create/editsheet.aspx" title="Edit Fantasy Racing Cheat Sheet"></siteMapNode>
        <siteMapNode url="~/fantasy-racing/nascar/create/newsheet.aspx" title="New Fantasy Racing Cheat Sheet"></siteMapNode>
        <siteMapNode url="~/fantasy-racing/nascar/create/managesheets.aspx" title="Manage Fantasy Racing Cheat Sheet"></siteMapNode>
      </siteMapNode> <!-- Close Fantasy Racing Cheat Sheet Creation -->
 
      <!-- Fantasy Racing Free -->
      <siteMapNode url="/FantasyRacingFree" title="Free Fantasy Racing Resources" roles="*" link="false">
        <!-- Links -->
        <siteMapNode url="~/fantasy-racing/nascar/free/links.aspx" title="Fantasy Racing Links" description="This page contains links to various fantasy NASCAR racing websites categorized by type." />
        <!--Fantasy NASCAR Driver Rankings-->
        <siteMapNode url="~/fantasy-racing/nascar/free/rankings/drivers.aspx" title="2011 NASCAR Driver Rankings" description="Use this free, custom fantasy racing cheat sheet to easily create your fantasy NASCAR driver rankings using drag and drop." />
        <!--Free Fantasy NASCAR Cheat Sheets-->
        <siteMapNode url="~/fantasy-racing/nascar/free/printable/drivers-cheat-sheet.aspx" title="Free Printable Fantasy Racing Cheat Sheet" description="This free, printable fantasy racing cheat sheet includes all drivers for the 2010 fantasy NASCAR draft." />
      </siteMapNode> <!-- Close Fantasy Racing Free -->
 
    </siteMapNode>  <!-- Close Fantasy Racing -->
 
 
    <!-- Legal -->
    <siteMapNode title="Legal" roles="*">
			<siteMapNode url="~/Legal/Disclaimer.aspx" title="Disclaimer" description="Read our legal disclaimer to learn about who we are AND AREN'T affiliated with."/>
			<siteMapNode url="~/Legal/PrivacyPolicy.aspx" title="Privacy Policy" description="Your privacy is important to us and we won't share this information."/>
			<siteMapNode url="~/Legal/TermsOfService.aspx" title="Terms of Service" description="Our Terms of Service provide you with rules dictating how you can use our website."/>
		</siteMapNode>  <!--Close Legal-->
 
 
    <!--Administrative-->
    <siteMapNode url="/AdminMain" roles="Administrator" title="Admin" showNode="false">
 
      <siteMapNode url="~/admin/summary.aspx" roles="Administrator" title="Stats" description="">
        <!--Users-->
        <siteMapNode title="Users"  roles="Administrator" url="/Users" description="">
          <siteMapNode url="~/admin/users/manageusers.aspx" roles="Administrator" title="Manage Users"  description="" />
          <siteMapNode url="~/admin/users/edituser.aspx" roles="Administrator" title="Edit User"  description="" />
        </siteMapNode>
        <!--Football-->
        <siteMapNode title="Football" roles="Administrator" url="/Football" description="">
          <siteMapNode url="~/admin/sports/football/sheetsettings.aspx" roles="Administrator" title="Sheet Settings"  description="" />
          <!--Players-->
          <siteMapNode title="Players" roles="Administrator" url="/FootballPlayers" description="">
            <siteMapNode url="~/admin/sports/football/players/manageplayers.aspx" roles="Administrator" title="Manage Players"  description="" />
            <!--Stats-->
            <siteMapNode title="Stats" url="/FootballStats" roles="Administrator"  description="">
              <siteMapNode url="~/admin/sports/football/players/stats/manageplayerseasonstats.aspx" roles="Administrator" title="Manage Player Season Stats" description="" />
              <siteMapNode title="Import" roles="Administrator" description="">
                <siteMapNode url="~/admin/sports/football/players/stats/import/importseasonstats.aspx" roles="Administrator" title="Import Season Stats"  description="" />
                <siteMapNode url="~/admin/sports/football/players/stats/import/mapplayerids.aspx" roles="Administrator" title="Map PlayerIDs"  description="" />
              </siteMapNode>
            </siteMapNode>
          </siteMapNode>
          <!--Supplementals-->
          <siteMapNode title="Supplementals" roles="Administrator" url="/FootballSupplementals"  description="">
            <siteMapNode roles="Administrator" url="~/admin/sports/football/supplementals/managesupplementalsheets.aspx" title="Manage Supplemental Sheets"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/football/supplementals/editsupplementalsheet.aspx" title="Edit Supplemental Sheet"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/football/supplementals/ranksupplementalplayers.aspx" title="Rank Supplemental Players"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/football/supplementals/managesupplementalsources.aspx" title="Manage Supplemental Sources"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/football/supplementals/scraperankings.aspx" title="Scrape Rankings"  description="" />
          </siteMapNode>
        </siteMapNode>
        <!--Racing-->
        <siteMapNode title="Racing" roles="Administrator" url="/Racing" description="">
          <siteMapNode url="~/admin/sports/racing/sheetsettings.aspx" roles="Administrator" title="Sheet Settings"  description="" />
          <!--Drivers-->
          <siteMapNode title="Drivers" roles="Administrator" url="/RacingDrivers" description="">
            <siteMapNode url="~/admin/sports/racing/drivers/managedrivers.aspx" roles="Administrator" title="Manage Drivers"  description="" />
            <!--Stats-->
            <siteMapNode title="Stats" url="/RacingStats" roles="Administrator"  description="">
              <siteMapNode url="~/admin/sports/racing/drivers/stats/managedriverseasonstats.aspx" roles="Administrator" title="Manage Driver Season Stats" description="" />
            </siteMapNode>
          </siteMapNode>
          <!--Supplementals-->
          <siteMapNode title="Supplementals" roles="Administrator" url="/RacingSupplementals"  description="">
            <siteMapNode roles="Administrator" url="~/admin/sports/racing/supplementals/managesupplementalsheets.aspx" title="Manage Racing Supplemental Sheets"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/racing/supplementals/ranksupplementalplayers.aspx" title="Rank Supplemental Players"  description="" />
            <siteMapNode roles="Administrator" url="~/admin/sports/racing/supplementals/editsupplementalsheet.aspx" title="Edit Supplemental Sheet"  description="" />
          </siteMapNode>
        </siteMapNode>  
        <!--Health-->
        <siteMapNode title="Health" roles="Administrator" url="/Health" description="">
          <siteMapNode roles="Administrator"  url="~/admin/health/manageexceptions.aspx" title="Manage Exceptions"  description="" />
        </siteMapNode>
      </siteMapNode>
 
 
      </siteMapNode>
 
		<siteMapNode title="Errors">
		</siteMapNode>
 
	</siteMapNode>
 
 
</siteMap>