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I recall encountering this, I went back, killed everything, and it was open. I checked... no monsters left. I warped as suggested and killed the monsters in there. Sucks having to cheat, but what can you do when something is buggy? Somehow though at least one of the monsters inside there became ...

No... I haven't cheated at all.

I don't know if this is a bug or what... but when I get to the exit on Z1M7 and kill the grey HellKnight (not sure what their names are)... well... nothing happens. The green door with the exit sign above it doesn't open. Shows on the map as a red door, and obviously I have all keys which you need ...

Edit: Excuse me... wrong project.