Default [Q] Cyanogenmod: IMEI is gone, after device encrypt


I use the Sony Xperia Z with Cyanogenmod (cm-11-20140207-NIGHTLY-yuga).

After I had encrypted device with dm-crypt, the IMEI and the SIM-Card was gone. No net...
If I reset the device over settings, factory state, then all work again.

What I can do?
Other ways of encrypt?

Sorry about my English and
Liebe Gre