This could be due to a “corrupt timeline” which happened in Final Cut Pro 7 and other programs. Basically the timeline is broken.
If you get a black screen in the viewer in Adobe Premiere Pro CC, check your playback mode first, and make sure it says composite mode and fully enabled. Also check your video tracks to make sure they are not disabled.
If this doesn’t fix it, create a new blank timeline. Then, copy and paste all the clips from your old timeline into the new one, and this should fix it.
If this doesn’t work, try making your clips offline, and then reconnecting them to refresh the media library.
If none of these work, quit, and restart and see if this fixes the problem.