Found the problem--a corrupted Avantgo on the Mobilon. What made me look for something other than a reinstall was that the Velo wasn't connecting either--but I just didn't realize that the Velo needs two-three minutes to talk properly to Avantgo.com
So Avantgo is still safe for CE 2.0 users, a relief, I'm sure, to the three people out there who still use it
Jake