I have had the "Not Enough Memory" problem initializing the Sound Manager on two different PowerMacs, one a 6100 running 8.1, and an 8500 running 8.6. A clean install of 8.6 cured the problem, until I dragged the preferences from my original apps over to the new System Folder from the Previous System Folder. Then the problem returned. I tried all of the things recommended above, to no avail. What worked was dragging the entire Preferences folder onto the Desktop, then rebooting. Then I dragged all of the Preferences (from the folder I put on the Desktop) BACK into the "new" Preferences folder, EXCEPT THE PREFERENCES THAT WERE ALREADY PRESENT IN THE "NEW" PREFERENCES FOLDER. All appears to be well. I will try the same thing with the 6100 now.