Since I installed Apple's Mountain Lion operating system PSE10 isn't responding. It loads but none of the tools work. Does anyone have any knowledge of what's going on?
It's very important for some reason to clear out the old preference files when updating to lion or mountain lion.
Go to your username>library>preferences and delete:
Adobe Photoshop Elements 9 Paths
Adobe Photoshop Elements 9 settings
This library is hidden in 10.8. To see it, option-click the go menu in the finder. While you're in there also delete any lockfiles with the same names and go to the saved application states folder and delete any for PSE.
Repair permissions and try again. If you still have trouble, uninstall, create a new admin user and install the program there.