Hi Xenon,
Thank you so much for your attention to this
Update:
I turned of persistant connections and my admin guru fooled around with some settings...
I also ran repair.php to the database.
So far so good... the weirdness has not occurred since we completed all that. Doesn't mean it won't (since it's SO sporadic it's not even often easy to track these weird posts down).
I'm going to let it run for a few days like this and see what happens. I'm also checking on some of my older hacks to make sure the code is all still compatible with the newest version.
Xenon... I did compare the wacky posts to "normal" ones -- the problem is, everything that should have appeared via the postbit was destroyed when the weirdness occurred -- so even doing a view-source showed nothing but emptiness where the guts of the post would be. If I tried to edit the post through the admin options drop-down, I'd just end up with database errors.
I'll also keep your archive hack handy. Once I get these other issues resolved for sure, I'll be willing to explore it more again. I don't want to go installing any new hacks while I'm still having problems
I'll keep ya updated -- and if anyone else has run into this similar weirdness, I'd love to hear about it, or hear how you resolved it.