With the latest MP update going live we've discovered a series of bugs that will be patched right away. We already know what's causing most of the issues so it shouldn't take us too long (approximately two days) to release a more stable version of the game.
Since we're considered about these issues we've decided to set the previous build as the first launch option for now. Once the biggest bugs are patched things will get back to normal in no time. In the meantime we advise to build in the [STABLE] version.
NOTE:
Play multiplayer by selecting the [EXPERIMENTAL MP] option in Steam.
Cheers!
Copybugpaste Team