lost thumbnails in gthumb

[Victor Munoz <vmunoz@macul.ciencias.uchile.cl>]

Hello. I'm running sid and suddenly I'm not able to see any thumbnails when
browsing directories with gthumb. Other users in the same computer are able
to browse the same pictures without problem, but I, the owner of the
pictures, cannot, ironically. 

I cannot think of anything special that I did with the pictures or gthumb
in the last two days to alter its behavior.

There was a ~/.thumbnails directory full of thumbnails, and I deleted it,
just in case gthumb was being confused. Nothing. I also "deleted all
thumbnails" from gthumb's Tools menu. Nothing. 
I removed and then installed gthumb again, and nothing. I still can't see
the thumbnails, while other users can. Ideas?

Thank you very much in advance,

      	       	       	       	Victor