ToME: the Tales of Maj'Eyal

Not entirely sure that this is a bug, but -- in my latest run (Shaloren Paradox Mage), I challenged the Weirdling Horror a little too early. After spending my See the Threads, I died against the Horror. I chose to be sent back, and immediately ran for it. But when I returned to try again, the Horror was gone, and the door was still sealed. I tried leaving and re-entering both that level and the entire Old Forest, but no joy.

Possibly relatedly, the level just about that - the last level of the Ruins of Nur - keeps respawning all its enemies, uniquely (as far as I know) among Zones.

As a side question, is there any way of recovering my game at this point? Can I hack the door open or the Horror back into existence somehow? I'm new enough that I don't have a lot of successful runs under my belt, so I'd kinda rather not give up on this one...