I just updated my Mac OS to Yosemite. Every other program is working fine, but not Photoshop. I've tried everything mentioned in the forums, including updating the JAVA program, a restart and still PS will not open, giving me a "An unexpected and unrecoverable problem has just occurred. Photoshop will now exit." warning. HELP! I rely very heavily on this program and my attempts to obtain help from Adobe have been utterly futile.
Reinstall Photoshop CS5 to replace the files damaged by the MacOS 10.10 installer.