Shouldn't HFS have a auto-save feature?
that's not your problem.
corruption happens mainly because the file is saved.... while the system crashes.
i'm sorry for your problem.
the best advice i can give is to always backup the files you don't want to lose, since no machine is faultless. Remember it's a beta version.
Look if you have another file near the corrupted one, hfs may have backupped it. Indeed, HFS has by default enabled the "backup on save" option, that will leave a ".bak" file in the same folder.
