Firefix 1.0 history and cache occasionally VANISH! GRAAAAGH!

[Angry Girl]

Merry Christmas everyone!

Does anyone know wtf is going on here? I'm so annoyed!!!! Ever since I upgraded to Firefox 1.0, every so often my history and cache just vanish! My cache is set to 50MB and my history at 15 days under options. Everything will be fine for days, up to maybe a week or so, and then I'll close Firefox, as I do oodles of times each day, and the next time I call it, Firefox takes a long time to come up and the frickin' history and type-thrus or whatever it's called in the URL bar where you type things, everything's GONE! :-(

Anybody have any clues? I use MozBackup 1.4 and I suppose I could start backing up the cache (but I'd really rather not).

Thanks!
Alicia