Absolute Rubbish! Do not touch it. I have used Acrobat Professional for years upgrading as the new version comes out, well according to adobe tech support, Ver 8 is not supported on Intel Macs???? I corrected the gentleman on this and he went off and checked. He came back to me after a few minutes and admitted he was wrong. Daaah. Surely he should know. He's in tech support! After half an hour of troubleshooting I agreed with him that after logging in as a different user it worked fine, that it had become corrupt in my user account. The solution he offered was to delete my whole user account and create another as Acrobat 8 Prof does not have preference files which can be deleted if they become corrupt. I have never had to do this just for one application. What about all my settings for all my other applications? This didn't concern him at all. What a joke!!!