OK got it this time.

I feel that the various body parts are moving because you have built in ERC code linking their translation parameters with the BODY's Master parameters. A number of these Master parameters are not set at zero when the figure loads. You also have Master parameters slaved to other Master parameters.

I tried to trace down all the links to see exactly what was being affected when you dropped to floor however I do not think I'll live long enough to be able to complete that task. :)

The simplest solution, and the one that I would be very happy as a user to accept would be to say in the readme that Ctrl+D should not be used. Just translate the body, no big deal.