Hey, well when using Nautilus and I browse to my images folder it only gives thumbnails for a few pictures. They are all jpegs and there is nothing strange about the ones it doesn't display. It is only giving thumbnails for about 3% of the images.
Also I think totem is buggered? As its not comming up and also video preview thumbnails have dissapeared.
totem is death atm, i still didn't find a proper solution to it.
try rebuilding it through abs and see :
Freedom is what i love