Hi, are you using a Steam version of the game or standalone (downloaded from Toribash website directly)? If it's standalone, make sure it's the latest version available (5.44).
Does connecting to rooms directly work for you or causes crashing too? You can try connecting to rooms with /jo roomname command in chat (press enter or T to open it).
If you still can't connect to multiplayer rooms, can you please upload the crash dump generated by your game client (if any) here? Crash dumps should be located in your Toribash installation folder.