Canvas flickering black in FCPX

Everything was fine until last night. Suddenly couldn't see anything in the canvas but figured out that hitting W fixed that problem.
Now all video in the canvas is flickering black when I play the video. Looks like about 2-3 frames of video interchanging with 2-3 frames of black at all times. Haven't seen any previous posts in the community that can solve this.
Also, when I import videos, I don't see the normal film strip in then browser, just a series of screen shots one after the other, and whichever screenshot the playhead is on gets displayed as black rather than scrolling through the video as I scrub across. I attached a screenshot. Any ideas??

This worked very briefly. I originally had the problem while re-editing the entire project because all of the video clips somehow disappeared (also, I did the first project with GoPro footage with the fisheye effect, and I'm replacing that footage with the same clips converted to widescreen).
I trashed the preferences using Preference Manager and then the clips played fine, no flickering. I then went back to my first project (see attached screenshot) to see if that one would play, but that whole project is still black for some reason. I tried re-linking the clips, but notice in the screen shot below, they don't show up as offline, there's just nothing there. Then I went back to my second project, where the flickering was yesterday, and the flickering is now back. I trashed the preferences again and this time it's not fixing the problem
The screenshot below is of my older project. Notice the playhead creates a blank square in the browser and nothing shows up in the canvas. This is the same in my other project, but all playback has that flickering.
Any advice will be greatly appreciated!

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