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

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...