I had cm-11-20150517-NIGHTLY working, then upgraded to cm-11-20150607-NIGHTLY. Now I get the error "No service" and have basically no GSM functionality whatsoever.
If I attempt to select a network operator, I get the error: "Error while searching for networks."
I installed this using TWRP, there were no issues with the install. Automatic upgrade failed, I believe this is due to an encrypted file system, something which TWRP does not handle.
What I have tried:
Rebooting by itself.
Removing the USB cable and rebooting (apparently this was a known issue before).
Reverting to cm-11-20150517-NIGHTLY, this does nothing, same problem.
Resetting APNs to default.
Device: GT-N7100, CyanogenMod version: 11-20150517-NIGHTLY-n7100, Android version: 4.4.4