Right Mouse Button doesn't work correctly in UE 4.14.1

Hi!

I’m a complete beginner and started doing tutorials, everything is going smoothly except i can’t seem to pan in viewport holding the rmb.

Every time i press the rmb in viewport, it gives me a drop down menu of options and i can pan for about 1 sec, after that, mouse movement does nothing.

Thanks in advance. :slight_smile: