Two weeks ago fine, now all playback is Jittery

I have been all over the forums reading posts about others with what sounds like the same problem. So far, I've got no fix for mine.
Footage IN PLAYBACK ONLY in FCPX 10.1.1 is jittery, it's like somebodies trying to make a rap album both video and audio jitter thoughout play, though audio is 'less' affected.
Two weeks ago I did not have this problem.
All my old projects are equally effected.
Files ingested for new project are same as all other projects.
Model Name:          Mac Pro
Model Identifier:          MacPro4,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.26 GHz
Number of Processors:          2
Total Number of Cores:          8
L2 Cache (per Core):          256 KB
L3 Cache (per Processor):          8 MB
Memory:          16 GB
Internal Harddrive with FCPX: 565 Gb available (out of 2TB)
Internate Harddrive with Media files: 480 GB available (out of 2TB)
(This is the exact same thing it was two weeks ago)
Media: Proxy media, optimized media. All rendered. Does not matter which I choose.
Quality: Better Performance.
Does not matter if background rendering is going or has finished.
I've deleted perferences. No fix.
Last ditch effort is to reinstall FCP see if that fixes it.
Any help, much appreciated. Major deadline coming up. And while I could probably work with it (render files out of it are perfectly fine, media files ingested into it playback fine) it's quite a nuisance to do any fine tune editing.
Thanks.
Michael

FOLLOW UP:
Reinstall did nothing to change it. And I've also noticed a couple of other weird anomalies with FCPX, see below
To Russ:
Did all those and no change. Tried all sorts of variations of the display settings, no change.
Things I also did where to complete close out, open up a clean copy, create an entirely new library for just the ingest.  Had some issues with the CREATE button as it seemed to create the library and then froze on the screen and wouldn't go away, if I clicked create again it said there was one already named that if I tried to hit cancel nothing happens. Finally had to quit, restart.
No change.
Russ. I have absolutely NO other issues with video in any other programs I use. It's hard to believe it's the video card BUT to rule that out, is there a way I can get a definitive answer to the card being good or bad?
Thanks for the help.
Michael

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