Red Plug during spectating

I'm not sure when this started, but it was probably a build or two ago, but now every time I go into spectating (either after death or in spectator "team") I get the red plug. This causes everything to freeze except for the player I'm spectating (only the player moves around and I don't see any other people. Not sure if it's just a corrupted file or something, because I haven't heard of this happening to anyone else...

Thanks,