Photoshop :: Image Blanks When Clicking With Polygon

When I am in an image, selecting an area with the polygon lasso tool, every time I click a point, the image blanks out and does not redraw. I am left with my pologon selection lines and a white image where the photo should be.  The only way to get the image back is to force it to scroll. I have to extend the tool off one side of the image or another to make it scroll.  Otherwise the screen does not redraw.  I am forced to work with my images in a window instead of fullscreen to ensure that I have part of the image to scroll to when the image blanks out.  It is doing this with every click of the polygon lasso tool. Needless to say, this is maddening!  Has anyone seen this behavior before?   I am running Adobe Photoshop CS3 on Windows XP and the program is up to date.  I have two gigs of ram and have moved up the memory allocated to Photoshop from half to two thirds.  I have stopped having other programs opened.  I also tried turning off the preference for the 3D graphics acceleration. So far nothing has worked to fix the problem. I have about 1100 product photos to clip out -