Chris, => Have you tried checking your backups to pinpoint when the corruption => happened? To be honest, the problem is in a client's machine and has only happened twice in a year. They are not willing to pay me to investigate and I just dont have the time for such work. => One final thing, I find it interesting that exporting and => importing seems to fix your problem. More interesting, I find that export+import as .zexp does not work, but exporting+import as .xml does work. I really dont know much about the difference, but the .zexp seems to just grab a chunk of the ZODB errors and all, but .xml is a true export of the data. Anyway, I sent this message off for discussion purposes, we have fixed the problem and moved on. I am just curious about why this happened and if others have similar experiences. Tom