Hi, maybe this link will give useful ideas to solve the problem.
You could try these :
1. Run the installer again, every file is going to ne checked.
2. Delete or move for backup the entire X-plane 11/Output/Preferences folder
If none of these solutions work, it might be a more serious bug and you could file a bug report here, with as many details as possible, so that Laminar Research can reproduce the crash easily :
http://dev.x-plane.com/support/bugreport.html
Regards,
Guillaume