i have cs5 suite. last week everything fine in photoshop. this week, only the tools that are showing are available to use. i can not access the tools when i click on the corner of individual tools. driving me nuts! i am running version 10.6.8
Generally, GUI display issues are related to video drivers, but with a Mac, the video drivers are updated with the OS. Have you updated your OS from Apple recently?
Also, mouse, or tablet drivers can cause similar. Not sure about the tablet, if you have one, but would assume that the mouse driver would also be updated with the Mac OS.