[curt.clifton]

The error messages just indicate that OF couldn't connect to MobileMe when it tried. There are lots of possible reasons for that, network trouble, temporary MobileMe outage, etc.

Regarding switching back to OSS, you'll want to make sure all the clients are synchronized. Then connect one of them to OSS. You should get a message about the two databases not matching and be prompted to pick one of them to use. Choose to use the one on you local machine. Once that syncs successfully, then switch each of the other devices over, but choose to use the server database with them.