Adobe Premiere Pro CC 2015 (and earlier) users can experience unexpected behavior after upgrading to Mac OS X 10.11 (El Capitan). These issues will be addressed in a future release. However, Adobe recommends that users remain on Mac OS X 10.10.x for now.
One common occurrence is that when video is paused, the image takes on a yellow-green hue with red stripes (see image). The current workaround is to change the renderer to Mercury Playback Engine Software Only in Project Settings.
For more information, see this blog post.