"Why am I getting yellow and red lines running through my footage on pause?"
This is a problem that can occur if you are running Premiere Pro CC 2015, or earlier with Mac OS X 10.11 (El Capitan). Currently, it is suggested to remain on OS X 10.9 or OS X 10.10 for Premiere Pro CC 2015 and earlier for the time being. We do know about the issue and are working on a fix.
If you have already updated to OS X 10.11, you can work around this issue by doing one of the following: