If you have a camera with ‘Tick Even when Paused’ enabled, it will tick while paused, however it will not update the viewport.

UE 4.8.3: I had the same problem today. I was able to fix it by setting bShouldPerformFullTickWhenPaused = true in the APlayerController ( in addition to bTickEvenWhenPaused of the camera ). This flag is checked in the UWorld::Tick and then PlayerController->UpdateCameraManager(…) updates the view a…