No, nothing been changed "specifically" in the electric, except new starter/ignition system.
check your cfg file - maybe you have some assigned parameter, but not used (not connected).
As it was described on update (for v 9.59 on Patreon blog), you need to upload your cfg file to the configurator, just click on the switch type you need (in the "Ignition/Start"section in the Layout Maps ), and save your file again.
The configurator will save the engine/aircraft type based on the image map you select, and the starter will work correctly then (this is required by the new universal functions).
For B737 you should have the ignition type 3, assigned in the Systems  - in the header of the data.cfg file you can see the Systems line position 16 (started with 0).
Else, when you switch to CONT, etc, it can be another mode for igniters.