Either Overwolf itself or the app makes my game frozen. I accept a match, then I see the stats overlay, and regardless of what I do next, I never finish loading into the game. The only way to be able to play is closing the game, then Overwolf and reconnect. I play on Windows 10 x64 with DX9.
Another issue if you start Overwolf AFTER running the game your app won't correctly detect the renderer, claiming it is not DX9.