I don't know whether it is fixed or not..I just found a trick to install baseband switcher application and make it work fine..
1) install the latest supersu application.
2)install the baseband switcher application Version 4.0..I repeat 4.0 (See attachment)
3)change baseband using the application..It even saves the settings in the settings->Advanced.
Try it..It works,,
Already known, maybe if you read last pages... I use version 4.1