When exporting a movie in QuickTime Pro ...

I have been exporting .mov files captured from streaming video almost daily for several years. Now all of a sudden - with NO changes of settings - the exported file is solid pink on the left side and solid green on the right side of EVERY frame! I have changed nothing since 2 days ago when the export was successful. The files will export properly on my MacBook, but not on the iMac. How can I fix this? (QT Pro v. 7.6.4)

---

Orignal From: When exporting a movie in QuickTime Pro ...