This can happen when AE (or more usually a plugin) runs out of memory. The frame fails to render, but AE keeps going and (I think) provides a blank image to QT which renders it as white. Usually this doesn’t continue for long before the render fails. Check the render queue to see if the render finished or not. I’ve seen it occur for about 30-40 frames at the most before it causes a render failure.
If it continues to happen, break the render up into two sections. Render one out, restart AE, then render the second section out.
cheers,
Jim
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Jim Tierney
Digital Anarchy
http://www.digitalanarchy.com
415-586-8434