Default [Q] Restoring a CWR Backup?

I have made a CWR backup of my rooted 1.1 stock rom with all my installed apps. I tried out the new 1.2 update and then tried to restore my backup. Everytime I connect to Wifi I get a message about problem authinticating and having to reflash to stock. How can I get my backup to restore correctly? Wipe data/cache? Won't that take out all my apps? Or am I stuck going back through 1.1 stock, autonooter, install apps/titanium restore?