Broken WE?

I was working on a map for a few hours when i started surfing the forums here. when i looked back my map was missing, and in it's place was a flashing screen. on the left(where the minimap is, and those menus) had a big triangle cut across it that was also flashing.

I closed, reopened WE and the black triangle was there, but not flashing. I loaded a map, and it began flashing again.

It seems to be something wrong with WE, not the map, because any map i load does it. Any ideas how to remedy?

I'm going to restart now, so if I don't post saying it's all fixed, then it's still broken.


EDIT: Restarting seemed to fix it. The map saved even though the whole thing was messed up.