I have Machinma 104 still loaded and I turn on skeleton bone view and can see the bones. This version uses SkelJoints under the Skeleton etc.
I load the same file into USD Compose 105 and turn on the same skeleton view but can see nothing. 105 however uses Omnijoints now, not SkelJoints. So I was wondering if the bone viewer needs updating as well to display the new bones approach in 105.