Strange behavior with poses.

I have been noticing that some of the poses I make in Poser cause parts of the AV to look deformed or misshapen once they are uploaded. For instance i did a pose where the AV is laying flat on their back on the ground with knees up, but the inner thigh looks very angular and not rounded anymore. Is there a way to minimize this sort of deformity in poses?

I know the problem of which you are speaking. I have figured out how to work around it, though honestly, I don't know why my workaround works.

I get the deformation problems when I start with the base pose (the one that sits at frame 1 as a reference but not actually played). I've created my animations with the playing part first. Then I make sure to keyframe the 2nd frame, and then add in the base pose as the first frame.

It has something to do with the way Poser interprets keyframes, and I'm still not exactly clear on how it works. There's something in that downloadable .bvh that will influence joint movements in a way that I can't figure out. But if I do the animation and inject the base pose as the last step, things seem to work out.

This is not an SL problem... it is the avatars and how the fall off zones of the joints are set up. These avatars are very low rez, so you are going to have problems like this as long as the current avatars are used. Every avatar in SL is using the same setup based on the default avatar.... size, joints and morphs. This is why clothes don't fit the same on all avies, and some animations and poses look really bad with certain sized avies.