I've successfully restored all systems, BB apps, 3rd party apps, and all calendar, address book, and messaging data after wiping my 8330m clean. It took a while to restore one 3rd party app at a time just in case one of them was the culprit, but it's purring now with almost 50MB ff. Wahoo!!!

I can't figure out what caused all the issues, but it may have been related to 1) the download of many demo apps and its deletion directly from the device or 2) YouMail, which gave me errors from day 1 and never worked without errors. Either way, YouMail and Documents To Go didn't make the cut and I'll be more careful with demoes in the future.

xliderider (and CX, of course) - thank you for all your help. The instructions were easy to follow and my phone is better than new! Thank goodness for CrackBerry!
A very greatful Abuser.