More choppy playback issues

None of the previous discussions have provided a solution, even though I followed all of their advice.
I have a new project, started on CC2014 V8.2.0
OS X Yosemite 10.10.2
Macbook Pro I7 16 GB 1600 MHz DDR3
NVIDIA GeForce GT 650M 1024 MB
Working on 1920X1080 sequence, *no* effects, absolutely none
footage and project file  on external thunderbolt 2Gb Western Digital HD
After playing the sequence for a few seconds, it starts to 'hang' and 'stutter' and will not play smoothly.
I have:
clicked "Maximum Render Quality" in sequence settings
unchecked "Composite in Linear Color" (although it keeps checking itself back on)
cleared all the caches, both within Premier, and using "WhatSize" app
restarted, rebooted, re-everythinged
Still will not play smoothly.  Any suggestions? Besides going back to FCX that is....

1. two weeks ago I completed a project with footage from the same camera, on the same computer, with the same drivers, and had no problem, so I have trouble believing it's the Nvidia driver.
2. I did turn off, then on, then off, then on, etc. the GPU acceleration, no effect
3. Again, the same project I completed two weeks ago was from the same external HD (You're right, 2Tb, sorry) and again no problem.
4. I upgraded to Yosemite just a couple of weeks after it came out, long enough ago that I can't remember exactly when, but again have completed many projects since without this problem.
5. I can play the mp4 files on any other program smoothly, VLC, Quicktime, RealPlayer, etc. so it's not the footage.
I went through the forums and tried every suggestion I  found, and it seems like there were indeed a lot of issues with choppy playback, and a lot of suggestions on how to fix it. None of the steps put forward have helped, and according to at least one of the forums I've read, that person was unable to find a workable solution. Starting from scratch seems pointless, since I just started this project fresh a few days ago.
I really feel like in the latest update from Adobe something else got screwed up and I have no choice but to live with it until they decide to acknowledge it and fix it.

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