Re: video playback jittery jerky stuttery
You may want to keep Activity Monitor (/Applications/Utilities) open and when the problem starts occurring, look for any unusual process whose CPU usage has gone up. You may also want to look at the Disk Activity tab when Pro Tools is not playing to see if there is any unexplained disk activity (read/write).
Another thing to try once the problem starts occurring would be to shrink the video window so it does not fill the entire screen. You are dragging the video window (Command+9) to a display and then sizing it to fill the display, correct?
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Jonathan S. Abrams, CEA, CEV, CBNT
Apple Certified - Technical Coordinator (v10.5), Support Professional (v10.6 through v10.10)
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