Motion Director Location issues

I’m about to start pulling my hair out! I use Motion Director – A LOT – and would love to use the MD Props, but they’re completely useless after applying any other motion to the character!
For example, I created a project, imported some props from UE, then added a simple walk animation with MD. When I then go to use the “sit on chair” MD prop, it looks correct when first creating the motion:

But when I create the clip, the character goes back to his original location, before any animations were added.

I’ve hunted through the reference manual and every tutorial there is on YouTube, but I can’t find a solution to this and it’s frustrating the heck out of me!