Recently tried the 3.0 version ...and found it crashes with monotonous regularity when I return from the first level off the seven portals hub. Doesn't matter what I do: go beat up on some two-headed cretins or just stand there. Within a minute I'm back at the desktop. Tried with all three characters ...same results.

Err... Make sure you're using Hexen.wad version 1.1. I guess that could be the problem. If not, i dunno. Another guess i have may be a windows vista incompatibility if you use that.

Isn't 3.0 quite unstable still?

KMod 3.0 was never fully released, only a somewhat buggy beta version. After a somewhat lengthy absence from the team I have returned and am working on KMod again, hopefully I'll release a new version in the comming weeks. Since the beta release (far far to long ago) I've managed to fix a lot of the bugs that have been mentioned since then, so hopefully this issue is already sorted.

Thanks for the update. While waiting for Kmod...3.1? I'll return to 2.8.