Compare view is not working properly in LR CS. When I tell it to make candidate the select image or swap images, nothing happens.
Please reset the Lightroom preferences back to default.
Refer: http://www.lightroomforums.net/showthread.php?25197-Resetting-the-lightroom-preferences-fi le-updated
I turned off LR and the computer and rebooted - that solved the problem. Thanks.
Retrieving data ...