Stuck monster bug

[hasim]

Hello everyone!,

First of all congratulations for a great game! It sure has me hooked.
One small bug however - I am in lower hadar and a monster stack is stuck in an elevator. I cannot fight it, and I cannot enter the elevator to go up in upper hadar.
any help please?
I have reloaded an earlier save but nothing. I would prefer not having to reload a very much earlier save because it would take me very far back.

Thanks in advance.