I get a black screen every time I try to get into a 5v5 ranked, unranked, 5v5 blind, and 3v3blind
http://imgur.com/u0NtmWv
Here is a screenshot of what it does after accepting a 5v5 blind or even trying to get into the role choosing screen.
Here is a screenshot of what it does after accepting a 5v5 blind or even trying to get into the role choosing screen.
No idea if this is your problem, but why do you have a version of Windows 8 that's still not authenticated?