I just spent the better part of yesterday afternoon getting Homesite 5 to work again, so I thought I'd share what happened and what I learned. If anyone else runs into a related problem they may be glad for the information.
I've always seen strange behavior in H5 when I open it off-line and then go online. The directory file listing in the utility window starts loading and reloading like crazy for a while. And sometimes it generates various Windows error messages during the process. After a while it usually stabilizes again -- but I still try to remember this oddity and not have H5 open at the same time when I log on because sometimes it locks the whole operating system when it does this little dance.
Yeterday I forgot. After I rebooted (yes, it took a reboot this time) Homesite refused to save any file at all. The error message said "cannot write to autobackup.ini". Well, an editor that can't save a file is pretty useless and I really didn't like the idea of returning to some other HTML editor. I've grown to love Homesite's features, despite this cranky little bug.
After much poking around in the Help files, I discovered that there is a directory called Autobackup and it contains the culprit file, autobackup.ini
The saving grace here is that you can customize H5 to use a different directory for storing its autobackup files -- or you can even disable the autobackup feature altogether if you can handle working without a safety net.
So I created a new directory which I called autobackup2. Then, when I customized Homesite to save autobackups to that new directory, Homesite automatically generated a new autobackup.ini file for it. And all was well again.
I may have suffered from an uncommon problem here, or it may be more common - I can't say. But I'm glad for the in depth understanding of the new autobackup feature.