Anthanasius: confirmed - unchecking the eyebrow in the 'collide against' gets round the problem.

seeker: that seems to be another way round the problem. I think I moved the stray vertices into the soft decorated group and that worked. I think rosemary tried moving them into the dynamic group and that worked. And I guess that putting them in the hard decorated group would work too?

So we have a couple of ways around the problem.

But why does this happen at all? In Poser 8+ the eyebrow actor, even if it's invisible, is moving with V4. So any vertices that are constrained to the eyebrow, even if it's invisible, should surely be moving with it - like they do in Poser 6.

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).