I have Photoshop CS and am having a problem with the tools. When I open the App the tools work fine but after like 20 minutes or so I will click on a tool and move the mouse cursor over to the document to work on it and will only get my regular mouse cursor. In order to remedy this problem I have to save my work, shut down Photoshop and start it up again. Then I have about another 20 minutes before it freezes again. Can anyone help me identify this problem and fix it?