I do a lot of product clipping, and for a great part of it I prefer the polygonal lasso instead of the pen tool. On multiple windows devices and multiple versions when you are zoomed in and moving around an image making a selection while using the polygonal lasso tool, the image blurs and you have to zoom in/out to refresh it. It obviously has something to do with the graphics card. I always thought maybe my old system was a bit slow, but now I am in a new machine and it still happens. I will see if I can get a picture of it next time.