I am using Poser 8, yes.  I have noticed the knee buckling problem in the middle of a mixed animation using walk in place.  So it isn't wholly the path-following function, but I think that complicates matters.  I think part of it, with paths, is that it's trying to calculate the stride lengths to fit the characteristics of the path.  When the figure turns, it puts down a foot and pivots on the weight.  Which is as it should be, but I think in order to accomplish that many other things get snafu'd.  :lol:

Basically, our problem is whatever automatic posing is being applied by the WD, rather than the input poses.  And that's where we really can't control things.  :sad:

I'd be interested in seeing a control test, using Posette or another figure, to see if the peculiarities with which we're struggling show up for other figures.    That should help us understand what may be able to be corrected and what we just have to accept.  I was planning to try this today, but I've been distracted.  :lol:

What can we vary, to try to control results?  I have:

• thighLength
• hipHeight
• feetDistance
• "Favored" IK angles
• Joint rotation limits

The first three are apparently now correct for the figure.  I'm not sure how to set the IK angles (drat the search functions in this place :lol:).  Setting up joint limits, at least in the legs, may help us, but I wouldn't want to force unnatural limits.

Is there anything else you can think of?  Perhaps it really is the source poses and we have euler problems of some sort, due to the differing joint defaults?

===========================sigline======================================================

Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.