Engine crash when I change from perspective view

Hi, I looked everywhere in forums and youtube but I didn’t find an answer. I change to UE4.21 and now I have a problem, when I want to change from perspective view in any other view like top, left and so on, the engine crashes. I can’t work like that because only in perspective Mode one can simply didn’t see everything. Maybe someone has the same problem and know the answer. Thank you all.