I literally cannot post anything in the forums, or even report a bug.
For that matter, about 5% of my games I play on the PBE result in a black screen connecting to a server, but when I am in game I have less ping than than NA.
Why you would do this?
PBE is down for maintenance right now (https://status.pbe.leagueoflegends.com/#pbe). Same happened to me. As for posting in the PBE boards, you need to log into those separately from your live credentials. This means one of two things: log out of your account THEN log into the PBE boards or open an incognito window then log into the PBE boards.
Riot's SSO (single sign on) is pretty bad, when it comes to the boards & other tools, but it isn't their fault It is likely a problem with the SSO solution they are using.
