So, I just downloaded PB2 today to see what it was like. Except not being able to join the other servers it was as good as I hoped. However, when me and my friend were playing he tried to crouch using the CTRL key and open the chat at the same time. This "CTRL + ENTER" caused a small bug... at first it caused him to leave the match and then he sent me a picture of the map but all the decorations were missing, so it was just the walls. Then he decided to keep pressing CTRL + ENTER and some weird things happened. We tested it some more and what screens come out are based on where you are: the main menu, a level/match, the multiplayer lobby. I saved one of the weirdest pictures, mostly wondering where this came from...
http://prntscr.com/ljet8r (Note: the image is actually flashing, but I don't have the time to turn it into a gif D:)