I have a strange bug where an image thumbnail isn't being used: http://www.dualmonitorbackgrounds.com/gascan/
I have uploaded the image again and it works fine, but I thought I would leave the bugged version up in case it can help find the bug.
In the cache folder there are 2 candidates for thumbnails:
st-04_249_cw249_ch87_thumb.jpg
st-04_w249_h87_cw249_ch87_thumb.jpg
But still the thumbnail image used on the album page is the full image.
Any ideas?