Hello, I am currently running Rhino4 SR6 on Windows 7 using Parallels 5. When moving the cursor around the screen it would drag behind, constantly blinking a few milliseconds 'back in time' so to speak, making pin pointing a location tricky and frustrating. I followed steps 2 and 3 at the following link, which has fixed the issue when the cursor has nothing to interact with and is moving in empty space. http://wiki.mcneel.com/rhino/slowcursor#rhino_40_slow_or_stuck_cursor_movement However when there is a model loaded in Rhino, the same issue arrises when the cursor comes into contact with snap points. The cursor snaps to the point, as you would expect, but when you move the cursor away from the snap point it moves a couple of mm before blinking backwards to the snap point. I can't describe how frustrating this is.. something along the lines of dragging a spoilt child through a toy store and having them break free and cling to the last toy they saw.. I'm not a parent don't worry Anyway I was hoping someone might be able to help with this problem. At the moment it's giving me one more reason not to study and that's not good. Thanks for reading!