tdm
Android Expert
Sweet, thanks for the tip! 4G didn't come up right away, I toggled it off and back on and it connected. Dirty flashed from CM10.1 using CWM. It ran thru upgrading all apps and rebooted once, running fine so far.
This points to the APN database (the runtime sqlite db in /data) as the culprit. I saw this problem in neph's logs. I'll need to investigate exactly how that is populated and used.