Hey Markschum, last night I tried out the script on a BVH animation I had previously tried fixing by hand (I went back to the original raw file) and it worked great!!! The only glitch was that the Left Shoulder rotated "backwards" to what it should have been, but--tho I don't know anything about code--I fortunately know Poser well enough that I know that the numbers often run opposite on the left vs. right limbs, and with the help of your clear and annotated script, I thought "what the heck" and tried changing the "+" to a "–" on the Left Shoulder rotation, and that took care of it!

Again, thanks SO MUCH for this--it's going to be enormously useful to me! How can I repay your kindness??

--Tim