First, looking into a Safari problem is low priority (I've been wrapped up moving websites OFF a Site5 server 'cause they force use of a shared mail server AND they allow spammers - I need to NOT have my e-mail blocked) but SitePoint has a version of my tutorial online at http://www.sitepoint.com/article/apa...write-examples.
Then, your regex does NOT match the link you show - where is the trailing /? My favorite bug-a-boo, specificity, would help you if that second atom is either updated or added (and a better key is recommended):
Don't forget the Last flag, too!
RewriteRule ^movies/([a-zA-Z0-9\-]+)\/(added|updated)/? tags/index.php?title=$1&$2=$2 [L]