QUICKTIME VIDEO ISSUES
If you notice that you video playback looks scrambled 

you will need to change a setting in your Quicktime player to correct this.

You will need to first open the Quicktime Program 

then  click on Edit > Preferences > Quicktime Preferences

Once here you will need to choose Video Settings from the drop down menu 

Once in the Video Settings you will need to choose Safe Mode 

This should correct the Video issue in Quicktime.