I'm seeing the same issue as reported by Rampa.
Hi Edit motion layer crashes when I click outisde a bone in the 3d wiew. if i sectect the bone via the edit layer window, it seems to work well. Michel
I've been seeing this too. It seems to effect props and non-human avatars. But when the gizmo is selected to modify bone, and a new bone is selected, the gizmo does not move to it. If I move the mouse over the new bone with the right button held down, the gizmo will then jump to the bone. The third time I do this causes a crash.