I'm having this issue. I've reinstalled both the game and the editor twice. It was working before the recent patch, so I'm guessing that's the issue.
I'm also hitting an issue while trying to switch into the game mode on custom maps. The UI shows up, but the actual terrain and any items are not visible, just a black screen.
The error I get is:
"Attempted to read or write protected memory. This is often an idication that other memory is corrupt."
