Hi, I have Windows 7 Proffesional and PS CC. I noticed that Quick Mask mode does not working. If I press the icon or press Q, the PS program freezes and several red rectangles appear over the opened image, but no brush is functional. I have to kill the PS from Task Manager. In Task Manager, sometimes photoshop.exe appears to use over 90% of processor power. This happens everytime and ONLY when I want to use Quick Mask. What is the problem?