Why is my QuickTime video displaying a green screen?

Your QuickTime player displaying a green screen instead of the movie may have something to do with DirectX hardware acceleration.
To fix this issue:
1. Open Quicktime and select Edit in the upper left.
2. Select Preferences then QuickTime Preferences...
3. In the Prefrences Control Panel that opens, select the Advanced tab in the upper right.
4. Uncheck the Enable DirectDraw Acceleration and the Enable Direct 3D video acceleration.