First time I have attempted to use this property. After meshing & hitting run, an error message quickly returns "Non-positive definite Moment of Inertia matrix at remote mass 4". I only have 1 mass currently connected with rigid links. Any help appreciated .
Glad it works.
The Lxy Lxz Lyz properties have to be less than the Lxx, Lyy, Lzz. or the error occours.
There is a reasonably good article on Wikipedia on Principle Moments of inertia.