Upgrade the Quicktracks plug-in 3.x.x to version 18.104.22.168 to solve the problem. The update is free and can be found at:
We recommend that all Quicktracks users update to the new version. Other improvements in 22.214.171.124 are:
Compatibility with QuickTime 7
Faster decompressing of purchased files
Functions that were not working properly were:
Online purchasing and downloading individual tunes from inside the Maestro or Assistant causing silence on playback.
Online purchasing and downloading an entire SmartSound CD from inside the Maestro or Assistant causing silence on playback.
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QuickTime 7 & SmartSound Quicktracks
QuickTime 7 & Sonicfire Pro
Why is Quicktracks on my computer?
How do I get a replacement CD for Quicktracks?
Using Quicktracks in Premiere Elements 1-4