Yeah I was thinking it was the key listener and saw you also suggested it. When you uncheck / save it, it should remove the Windows hook that was placed. Then place it once you check and save.

When the error next occurs, another test you can do is try changing the hotkey. It uses the same listener as in-game.

All of my time at the moment is spent on getting the overlay working for x64 Planetside so I really appreciate the debugging help.