I was hoping to find that Glowworm made it feasible to render complex (but not that complex) scenes intact;  i.e. using multiple passes, but not needing to render different figures separately.   It didn't seem to make a huge amount of difference in that area.   If Poser 6 couldn't handle the render in one go, Glowworm couldn't, either.   I should say, though, that other Glowworm users seem to have had better luck than I did.

I did detect a very peculiar problem, which seemed to be unique to Glowworm, involving textures.   I had a scene with three V3 figures, all wearing variations of the same material, plus three different hairstyles.   They were in a Stonemason setting, with another Stonemason setting in the background.  In one render, textures for the V3 clothing were applied to Stonemason's buildings.   In another, textures from one of the hairstyles were applied in the same way.   Those Stonemason sets work perfectly every time in native Poser, or in Carrara (the scene was one I had previously rendered in P6 without a hitch, which is why I was using it for the test).

In another thread, from a while back (www.renderosity.com/mod/forumpro/showthread.php?thread_id=2699875 ), jonthecelt suggested that "Stonemason's prop files (meaning the pp2's) tend to refer to an outside .obj file which is stored in the geometry".   I wonder if Glowworm has a problem with that kind of set-up.   I've never seen any problem like that in Poser itself.