Logic Pro 9 expanding older file


I am trying to add to an older file which uses Vienna Symphonic Library samples. I don't remember how I originally composed it but I had to bounce tracks to get it to play through. Otherwise it stops, with the "system overload" error message.

When the file has been played say three times, even this may not happen and it plays normally.

The bounce-track option obviously doesn't work for composing.
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