I had to reinstall Photoshop CS4. I'm using Mac OS10.9. When I try to open "Adobe Photoshop CS4.app", I see the blue initializing window, then I get a window that says: "An unexpected and unrecoverable problem has occurred because you do not have the necessary access privilieges. Photoshop will now exit." I'm the administrator and the only user on my Mac Pro desktop. I have verified that the applications folder has Read & Write privileges for "system" and "admin", applied to the enclosed items. What do I need to do to get "the necessary access privileges"? Thanks.
You need to fix permissions on your user folder, most notably the Library. 10.9 uses differnt defaults and legacy apps don't know about it.