It looks like there’s a new Overlay extension, Center of Rotation, that shows the center of rotation. For those who want to disable it, a first option is to uncheck it in the Overlays Tray:
I’m not sure what may have changed. When I went to the Extension Manager looking for the Overlay, I just saw 3DxSketchUp. Disabling that, seemed to disable the SpaceMouse. Since I would generally not use that overlay, I would just disable it. They seem to be bundled now. Maybe I just didn’t update SpaceMouse last year?
I may hunt around in: C:\Program Files\3Dconnexion\3DxWare\3DxSketchUp to see if I can understand what’s going on…