This could be an issue with the Current Engine setting in the Pro Tools Playback Engine, which could be resolved by picking a different Playback Engine. Check the solutions below for assistance:
Choosing a Different Playback Engine
- Launch Pro Tools 9 and wait for the splash screen to appear.
- Then, hold down the n key on your keyboard, which will eventually open the Playback Engine dialog for Pro Tools.
- At the top of this window, locate Current Engine drop-down menu and choose a different Engine (such as Pro Tools Aggregate I/O) Once completed, click OK.
This should allow Pro Tools to launch!
Additional Solution on Mac OS X
If the solution above fails, you can try deleting the “com.apple.audio.AggregateDevices.plist” preference on Mac OS X. You can find this preference file in the following location:
- Macintosh HD > Library > Preferences
Driver Updates (Mac and Windows)
If you are upgrading to Pro Tools 9, download and install the latest drivers for your Avid, Digidesign or M-Audio hardware from this article.
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