It seems that in this open beta version, when you're loading in to a map there are black bars at the top and bottom of the screen, such as the one seen on this screenshot (although it only manages to catch the top bar). I guess they're not really bars although I'm not exactly sure what else to call them. It's more like the loading screen is in a box, and the ceiling and floor are black. I've tested on live to double check to see if this was a unique bug to open beta or an existing bug on live, and it seems to be a bug caused from this open beta patch since I do not have this issue on live.