I agree with Mark, render the video without the text, then try adding the text back in a project that uses the rendered video.
Alternately you could compose the text in a separate project and render it using the QuickTime Animation codec which will give you an alpha channel. Then drop that rendered file back into your main project. This is how I work all the time with BCC8. I usually work in a separate project and then render the results to save time when rendering the final project later.
~jr
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