I just updated to 2004 SP1 and have a repeatable CTD with spaceball movement. I have the latest drivers for spaceware and the SW plugin. Try - Open any part Set part Display to - Hidden Line Visible Make sure "Draft Quality HLR/HLV" is OFF Try to rotate with Spaceball. Can anyone else repeat? SolidWorks 2004 SP1 Windows XP SP1 Quadro 550 XGL Dell 2.53-P4