Tagtool is crashing every time I try to connect to the projector. It’s not the cable I still watch movies with iPad and projector.
I have exactly the same problems. It’s because of the Apple update. And the problem is not solved.
With the upcoming iOS 11.3 the external display is working again. Only reconnection is still not fixed - you need to restart the app every time you connect a display. But it´s working again.
Looks like it will be released next week. Or if you cant wait - you can get the public beta from Apple at beta.apple.com