While cropping and editing images with the just Polygonal Lasso Tool the creen will freeze for no reason and without warning. This happens at random, the amount of work doesn't seem to be part of the reason becasue it can happen in the beggining of the day and I shut Photoshop at the end of the work day. When the scrren freezes the image won't scroll, the scroll bar moves but the image does not move. Can't use any other tool when this happens, and it only freezes the single tab. I can have 5 or 10 open tabs of images and click on to those and they work fine but the one that froze has to be closed and reopened in order for me to continue working on it. Doesn't happen too often but it is a frequent issue. Even after all the updates and re-installing the program many times, and not sure if this just happening on a Windows computer.