yes... I'm currently rebuild all the thumbnail of my forum, I'll try to rebuild the gallery image information and thumbnails after (rebuild 15000 thumbnails is a bit long...)
If you want to see what happen:
http://forums.polyloop.net/gallery/showimage.php?i=1096
No picture displayed. If you right clic on the "EARING" text and ask your browser to display the image, it will do it. (that's the weird thing...)