I've noticed a bug (I think) - whenever I name a thumbnail 'ad', which I used to do for some Audis, they turn out invisible:

http://imcdb.org/vehicle.php?id=325083#Comment1813126

Now, I know the images exist, as when editing the comment and copying the filename of the image takes me to the image in question:

http://pics.imcdb.org/4290/ad2.8.jpg

If the bug is not solvable, I might want to rename those concerned, as there aren't that many. I'm just interested in what might have caused this bug - as it's obviously something recent (I didn't notice when I posted the thumbs initially).