Hi Folks !
Have You done this old "trick". I usually do this after all updates..
Please, read these links and give a try..hopefully helps, REMEMBER BACKUPS !
https://www.x-plane.com/kb/deleting-preferences/
https://forums.x-plane.org/index.php?/forums/topic/122904-deleting-xp11-preferences/
I had yesterday same problems with TBM900, but deleting preferences and deleting TBM900 folder /X-Plane 11/Output and then restart X-Plane fixed blinking etc..