I upgraded to 1.2.9 via Simplescript, and when that had problems, did a manual install of the 1.2.9 3/16 nightly build. Everything seems to look pretty good, except the latest album I created has holes in it (thumbs/images that won't display):

http://www.bearinlet.com/simmetry/Zen/index.php?album=sports/CHHS%20JV%20LAX%20vs%20Orange%203_16_2010&page=2

For example, image DSC_3988.JPG on the page above. I use this same image size (4288x2848) in many other albums without problem. I've tried refreshing everything I can think of but no luck.

Ideas?

Please look at your server's error log to see what it is causing. It might be either a permissions issue or corrupt exif data.

Permissions look OK.

I get an error log like this each time it tries to display a problem thumbnail or full photo:

[22-Mar-2010 13:17:01] PHP Fatal error: Allowed memory size of 100663296 bytes exhausted (tried to allocate 11392 bytes) in /home1/bearinle/public_html/simmetry/Zen/zp-core/lib-GD.php on line 325

I upped the memory limit to 120M in php.ini, and now all thumbs and images display OK. Not sure why this was a problem with this album and not my earlier ones, as the image sizes are the same, but it works so I'm happy.