Not sure what is going on but when I click my middle mouse to rotate my assembly, the assembly zoom out all the way and even if I use "Zoom to Fit" my screen is still blank. I can only get my assembly back on the screen if I "Undo". If I exit SW all is well but after a few commands it happens all over again. I know I'm doing something wrong but I can't put my hand on what I'm doing. Have anyone else seen this? I tried to record it but the assembly goes so fast its hard to show what's happening.