Plot window freezes

The plot window sometimes freezes while tracking a single point forward/back. Happens whether I use the key commands 1,2 or the Tools. If I restart XMALab, I can track a few frames and then it happens again. When I click in the plot window the videos go to the frame, but the vertical line does not move and and the plot does not update if I move a point. I have run into this problem before, but I can’t understand why it only sometimes happens. An xma file in which it happens is attached here. Pig head precision study 20130916, Trials 2 and 3. Data are pubic in Minipig Feeding Study. I'm using Mac OS 10.11.5, but it has happened to me and one of my collaborators in 10.9 as well.

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