First bug can be reproduced by starting a game with multiple players or AI all without team (-) and teams unlocked. The game will start with the victory screen and its game over. Thus making murder party etc. very hard. We tried fixing this by giving each player a different team. This will allow you to start the game, but making alliances is very buggy, also the game might randomly end in a victory for someone (probably who's target it was, even though he wasn't the one who killed him) when someone is killed. About the alliances: U sometimes don't receive the invites someone sends or they can't receive it. This might be because that person is your target or he is your attacker in the case of murder party.
I am not sure if this is enough information for you to start with, but ask any question and i'll try to answer it. The bug is new since the new lobby came out.
Good luck.