There are many potential causes of file system corruption, and sometimes they can have very similar symptoms. This is why I hate try to debug such problems on web forums or on Ubuntu's Launchpad. Someone sees a relatively vague description of the problem on the web forum, immediately jump to the conclusion that it must be the same thing that they saw, and pile on the web thread. Always send us detailed information; if it's redundant with what someone else has sent, that's actually *good*. That way we can confirm a common pattern. But please don't assume a pattern where one doesn't exist; humans tend to do this even when it's not justified.