Had a group running up the promy Sunday morning, and when we would kill the Memory Receptacle to head up, about half of us would make it no problem, and half would get a black screen and have to shut down. When we reloaded, the ones who black screened would be back at the MR spot. Happened multiple times, and kept us from progressing up to the boss because each time we'd try, the ones in the group that made it would have to come back down to help kill the MR.

Clear all the remaining strays after boss, wait for the corpses to fully despawn including their nametag.

If you do this, nobody will blackscreen on those teleports.

This info might be too late to help you now, but it's useful to note for future.

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Also to add - having an order for going up so you don't have two people going at the same time is recommended (black screen happened on a few runs I've been involved with when 2 people went up together)

Thank you guys very much for the advice. I'll do both of these next time we try and will post the result.