[grashoper]

Well, i'm not exactly 100% sure because i'm sure there are multiple reasons why this could occur. In my case, I tried putting a ROM that was supposed to have a 3.35 Radio, and i only had the stock bell rom on my blower, and it completely locked up during the transfer and I had a hell of a time getting anything to load onto it at all. I can't remember the sequence of events that i ran on the RUU, but somehow i managed to get the 3.35 radio, and a ROM that i fried up myself on PPCKitchen. At that point, my Data dissapeared. Went back to stock radio and ROM, and went from there. I have reverted back to the stock ROM twice sence with no problems. Now i'm back running another custom ROM i made myself, based on the latest PPCKtichen, and 3.37 Radio. Working fantastic.
Perahps sometime over the weekend i can try to help you with yours. I have learned alot from this experience, and there is a whole host of things that you can try.
In the meantime, i have been working on a glitch the past week or so. the time stamp on all my SMS (Text) message always shows 3 hours ahead on all incoming messages. All other times on the phone are fine. E-Mail accounts, MSN messages Etc. I'm, stumped. several people report this problem on various websites, but no solution yet. Chow for now...

EDIT- When your attempting to put the stock ROM back on, are you running the original .40 Unlocker? if not, this is a must.