Hello,
I’ve discovered this bug in times of day one 
it’s problem with slew, so pls answer if you did some changes with slew. This is first question, important because what I discovered and sent to Zendesk is, if you start your sim at parking without start engines then, synchro heading bug with instrument/real heading can be not correctly centered/aligned. Don’t do slew if your engines are not ON. This is bug and also solution to it as I mentioned.