UE4 Interface Blank Screens

I’ve been using UE4.13 for a week now with little to no issue. I am currently still learning the systems, etc.
Recently, I began exploring the class system, and wanted to add a new C++ Component to a Static Mesh Actor. When I clicked the Add Component Button, a blank white screen appeared where I assume the configuration menu would be. Upon closing this, the entirety of UE4 became unresponsive until I closed the application entirely.

I’m not exactly sure what the issue is but I’d appreciate any help!