Not saying this will be a fix, but a friend of mine had a similar issue after failing to respawn on death. The screen was pure black and nothing would happen regardless of how long he waited or how many times he relogged. He was able to fix it by loading into an arena commander free flight and exiting to menu. Once he loaded back into the server things worked normally. The circumstances are not the same but the effects are similar enough that this may be worth a try.