I have the same issue. Upgraded from 5.0.2 → 5.1
Everything works fine except the camera possessing inside the sequencer.
If I create one of the dynamic cameras (ones that only spawn when the cutscene is playing)
It does look to work
I’ve also tried creating a brand new 5.1 project and all works perfect.
I’m going to see if I can somehow port my entire game over to a new 5.1 project and see if that resolves it.
Hoping its just an upgrade issue (be better than a full 5.1 global issue!)
Glad I’m not the only one 