Spinning Beach Ball of Death in Sountrack Pro/Logic/iTunes-one solution
Other programs - Safari, Text edit and non- A/V media programs worked fine.
First attempt at a solution - simple reboot. It did not fix it.
2nd attempt - run DiskWarrior on all media drives. Did not fix it.
I open up Activity Monitor and look for strange things hogging the CPU. Nothing there.
Now I'm worried. Has QT gone kaboom? What would have caused QT to go south when it was working fine yesterday. How do I reinstall it? But why would just QT go bad?
Because I really don't want to start mucking about with system components, I start thinking- beyond QT, what else does audio playback on my system have in common?
Well, the audio output from all these programs goes through my Mackie firewire mixer - and I left it on last night.
For grins, I turned off the mixer and computer, unplugged the mixer's firewire cable from the computer as well as the fw800 drives used for backup and went to have another cup of coffee.
15 minutes later, I plug everything back in, turn on the mixer then the computer and everything works normally.
Hope this helps someone in a similar situation.
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512k MacPlus with 40MB external SCSI drive, Mac OS 8.6 or Earlier