I imported a large slideshow from PSE-8 into PRE-8 with the intention of doing some further work. It took several hours to render the project which resulted in a 2GB MPEG file and an XMP file in the preview folder of the project. I saved the project and came back the next day to do some work and the project was no longer rendered. After I first rendered the project, I had the "green" line present but the next day the line was "red" and the project acted as if I had never rendered it. It's as if PRE couldn't find the render file the next time the project was opened.
Is there any to re-attach the render file to the project?