Damn, that's what I feared :( This is going to be a nightmare :(
Okay, next question ... as far as I can tell, the site itself is working great, from the users perspective, its just when we try to go into the 'manage' interface to add new folders and such that we have the problem ... we have yet to find a 'bad page' in the users front end ... if the Data.fs was corrupted, based on how you describe how it works above, shouldn't the users front end also be broken?
Depends on how things are broken. I suspect that the data structures for appending transactions are borked. (The unpack list error seems to support that.) In cases of Data.fs corruption, this is not an uncommon symptom. The good news is that you can still read things. At worst, you end up doing a bunch of copy/pasting of source between browser windows. If you can install ZSyncer, go for it. Else, the Zope export/import facilites should help a lot. --jcc