... But it isn't symmetrical. Not sure what else you want to know.

So basically you are saying that the Poser system does not for every vertex in x>0 find a symmetric vertex in x<0 or vice-versa within the search tolerance. This could be the result of:

1 - position drift as could result from:

    a -  rounding off in the .obj file or

    b - morph corrections made but not made symmetric.

2 - the symmetric vertex simply not being there. This case 2 (not being there) again could be the result of:

    a - position drift (vertex intended to be at x=0.0, it's own mirror, but the vertex drifted outside Poser's search tolerance range)

    b - there is no paired vertex

1a, 1b, and 2a are solved with a morph. 2b would be topology error, which would be much more serious.

Has ANYONE submitted the rigging tool issues to SM?  Asking this question seems stupid, but I was around for the single-axis scaling issue.  People bitched for years in the forums about it, but were also hell-bent on not submitting a bug report for it.  It didn't actually get fixed until a bug report was submitted.  And no, listing it in a Poser Bug thread in a forum isn't getting the issue into SM's pipeline.  It has to go through the process, and that starts with submitting a bug report.

RDNA had a long-running thread with SM on feature requests for the next version of Poser.  Not a single person discussed rigging.  There was a lot of whining about figures, though.