Upgrade the Quicktracks plug-in 3.x.x to version 22.214.171.124 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 126.96.36.199 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 & Sonicfire Pro
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Can't location Quicktracks plugin