I hate bugs like this :-).
I tried to mount a truecrypt filesystem (http://www.truecrypt.org/) and kept getting an error about a write that failed to write the requested amount of data.
Truecrypt uses a strange and wondrous combination of fuse and loop devices to access the encrypted image, so with all that going on, I decided to try rebooting before I panicked completely.
Rebooting worked fine. Now I'm left wondering what was busted.
Anyone else seen any mysterious errors with fuse or loop devices?
I couldn't even begin to imagine what to report this against if I wanted to try and bugzilla it :-).