This problem had appeared also in the A320/319 at different times. 

 

The issue is the checklists are calling out to turn lights off at 10000, however the copilot cannot turn the lights off. If I try to manually turn the switch, it immediately turns back on. The only way to turn lights off is to disengage the checklists. Like I mentioned above, this same problem existed in the A320, but I believe it was addressed in a previous update.

 

I am running the latest experimental builds and saw a post that this should have been addressed in the most recent update, however for me, the problem persists. 

Which version of the smaller buses are you running?  Have you updated to the latest version?

 

I have the updater set to look for experimental updates. As of this morning, everything is current.