Bug - Play - Selected ViewPort (like side view not setted camera)

Are you referring to this video series? https://docs.unrealengine.com/latest/INT/Videos/PLZlv_N0_O1gauJh60307mE_67jqK42twB/3GtGvNoL5UI/index.html

At what point did the error you are seeing occur? I have not been able to reproduce this thus far.