And the version of the OS you are using is a secret why?
Does turning off »Use Graphics Processor« in the Performance Preferences and restarting Photoshop have any bearing on the issue?
Are Photoshop and OS fully updated?
As with all unexplainable Photoshop-problems you might try trashing the prefs (after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved and making a note of the Preferences you’ve changed) by keeping command-alt-shift pressed on starting the program or starting from a new user-account.
System Maintenance (repairing permissions, purging PRAM, running cron-scripts, cleaning caches, etc.) might also be beneficial, Onyx has been recommended for such tasks.
Weeding out bad fonts never seems to be a bad idea, either. (Validate your fonts in Font Book and remove the bad ones.)
If 3rd party plug-ins are installed try disabling them to verify if one of those may be responsible for the problem.
Christoph touched on plug-ins, but I wanted to mention one more thing: You haven't copied plug-ins from an older version of Photoshop have you? Or pointed the Extra plug-ins folder setting at plug-ins from an older version of Photoshop?
Hi and thanks
Mac version is 10.7.4
The graphics processor idea didn't work and i can't see any tool called Onyx on that link you shared. I did find this http://www.onyxmac.com/ but it looks a bit suspect to me. To the best of my knowledge i am not using any plugins.
Please go into Help - System Info... in Photoshop, copy what's there, and paste it into a post here (remove the serial number info if you like). This will provide a lot of system details, such as plug-in info, that people can use to help you further.
thanks for the help - the fresh instal worked - i did get the system info and i am guessing this was the important part.
Optional and third party plug-ins: NONE
Plug-ins that failed to load: NONE
Installed TWAIN devices: NONE