Black screen when another player joins the lobby after the elevator's activated.

Had this happen twice today:
A) Other player and I step on the elevator, activating it.
B) Someone else joins the lobby before it goes down, leaving the elevator stuck.
C) After a minute or so of waiting, the joiner quits the party and the elevator goes down.
Everyone still in the party loses 10 mist and gets stuck on a black screen. It used to be that the elevator would go down on its own after 20-30 seconds, and things would progress normally from there.
I think this may have just happened to me, I had logged in and then went to join a party in the arcade. After clicking on the Join Party it skipped the loading screen and went to a black screen with the HUD and then locked up.

this happened with me, right now, and still stuck in same screen.
i try to join in mission "The Sovereign Slime". i guess im stuck in mission lobby, but i can see nothing, just a black screen and i cant send bug report bug by "F2" neither call a GM ingame.
i already try to close and open the game, but still stuck in the black screen with the hud used in explorations.
need help from a GM, please.
Friend and I just ran into this. Such a simple thing to handle with a state:check, that it shouldn't even be an issue.
I can't even log-in now, client crashes immediatly after login step.
Looks just like this thread, but no fix.
http://forums.spiralknights.com/en/node/30316
help?

Also, dont know if you guys noticed, but on that screenshot, the minimap says "Haven".
http://u.to/RjoPAg Proof.