I have reinstalled zope and zodb, and copied the data.fs across. It was about two days old. All the changes that I had made were gone. Luckily I made a backup of my app yesterday by exporting it.

I must have a bad understanding of how this works. I had imagined that everytime I hit CHANGE, that the data.fs file would have been updated.

It should

When the computer crashed where were all my current changes? Is there a temp file I might be able to recover, as I am still missing quite a few hours work!

THis never happened to me before, but it did yesterday (zope 2.1.4 on Win95) ! This seems like a bug. As for your error: I have had to throw away a corrupted (read: one that couldn't be opened) logfile before on NT. It made it possible to restart Zope again. I have wondered what strange corruptions could happen to a logfile, but apparently this may happen at times (especially if the logfile is getting big) hth Rik