Answered
All of my toolbar buttons (eg, Go to next page, Save, Undo,etc) have suddenly become very unresponsive! I can still use the Up/Down scroll arrows or the menu commands as before, and they respond immediately. But no longer the case with my toolbar buttons.
I uninstalled and then re-installed Acrobat Pro 9.3 (Mac OS Snow Leopard), restarted my MacBookPro, but the same problem of unresponsive toolbar buttons persists. How can I fix this issue?
An app called "Right Zoom" was causing a conflict with Acrobat Pro 9.3.3 (Mac OS X). Once I deleted Right Zoom, Acrobat Pro went back to acting correctly as before! No more app or OS freezing.