Thanks for the file, Greg.
Please note that I write in a forum, so more details than you might need, but others with varying backgrounds are reading along.
There is perhaps a misunderstanding in Priorities. To just set for several parts of the scene with the Priority to high (Generator 499) means only that you will create great problems. Nothing else is gained with it. This is not how it is supposed to works. Think of Generator more of the very latest parts, joints are more in the beginning of a motion, not the end.
Low priorities produces earlier the information, higher priorities later on, and nothing below will created after a higher number is processed. Many objects have a fixed Priority, they have to wait a frame then, if lower. IF a lower instance was calculated but needed the information from a higher priority, chances are that the information is then taken from the frame before . My tip, start much lower, not with Generator. The Animation level of Priority makes your leg working in sync with the Joints, but Expression is the typical start point.In teh file it was mostly Generator, I guess after a lot of trial and error. YOu mentioned it, I though you had used it for testing, but it is all over the place.
A good idea is to explore the Character Object, and its hierarchy as well as its Priority settings. Typically most of them are in the Expression range.
Another option to mess up a scene is given by not cleaning up an XPresso set up. Often XPresso can figure those things out, but don’t bet on it. The X-Manager>XGroup works from top to bottom, this needs to be sorted for a clean scene. It can work, but it can delay things as well. I checked your set ups, only some had this flow, but yes, most people don’t care, speaking of files that I explored in the past decades.
Let me know if there is anything else, I’m happy to look into it.
The file is send via PM, not public, as requested.
I have to do a test with the “Shift Priority Tag”, but that will take a while, as the scene file provided was not just a leg.
All the best
Suggested refresher:
http://www.cineversity.com//vidplaylist/priorities
edited