update: I finally confirmed that it was indeed slayer that is crashing the game. I found nothing useful in the BLF slayer thread to help though, besides reinstall everything, and I doubt that will work.
FINALLY, UPDATE 2: After searching in the help section of the BLF, I found out that Client_Suburbia crashes singleplayer. Removing it helps.
All that frustration for a client from a server that is rarely hosted at a good time, if at all?