Error "Could not initialize Photoshop because the file is locked" on Mac OS 10.5 (Photoshop CS3 and Photoshop Elements 6)

When you start Adobe Photoshop CS3 or Adobe Photoshop Elements 6 on Mac OS 10.5 (Leopard), the following error occurs and the application does not start: Could not initialize Photoshop because the file is locked or Could not intialize Photoshop Elements because the file is locked This and other problems can occur when a new operating system, in this case Mac OS 10.5 (Leopard)�is installed on top of the previous operatin... Read More