@dave r said:
That's very strange. I will frequently have three or four instances of SketchUp open at once. I'm running XP Pro but I would think Windows7 should be able to handle that, too. Have you looked at the computer's performance graph in the Task Manager (I assume that's still available in Windows 7) when you are running SketchUp and open the second session?
I'm running Windows 7 Ultimate, and I've never had a problem running multiple instances of SketchUp (7 or 8).
And yes, Win7 still has the Task Manager, and it still allows you to get at it the easy way (Ctrl/Shift/Esc).