Thumbnails in the NextGen Gallery are randomly not appearing. This may be a browser issue in which case I’m open to any browser hacks you could have in mind. Or maybe there’s a reasonable solution. Sometimes if I type “index.php” in the URL the thumbs will appear and sometimes it won’t. Sometimes if I view a page then go backwards, the thumbs appear. Also, this is mostly happening in Safari (and beta chrome for mac).
The thumbnails are created. The issue is that they randomly appear depending factors mentioned in the original post. If i click on a page and then go back the thumbnails will be there. Sometimes if I had “index.php” the thumbs will appear.
Solved. Without the height and width attributes defined in the IMG tag, the images were intermittent in some browsers. I know it’s good code to have it there but I didn’t realize it caused inconsistent results.