When starting a custom game, you are unable to get past the champion select screen with the error message: "Active Game not found."
For All Random is does this after the timer is below 0, Blind is when trying to select a champion. Chat still works though.
1. Create a custom game with the map: Proving Grounds
2. Get 9 other people in the lobby
3. Start the game
4. Error message
Occurrence: --% (8/9)
EDIT: I managed to get into a ABAM after 8 attempts.