Temporarily added some fprintf statements to try to figure out why JAABA hangs for a few seconds for some people when playing for frames that already have predictions.
Fixed a bug if you accidentally hit the Play Selection button when nothing is selected.
Fixed what looked like a typo -- there was a statement if isempty(t0>t1), when I think the statement should have just been if t0 > t1
ApplyPostprocessing was getting called on all experiments and all flies whenever Predict was called, even if no frames were being predicted on (Predict is called every now and then while the video is playing). This was causing a long wait, even when no predictions were changed. I added a check to see if anything changed during the PredictFast call, and also allowed ApplyPostprocessing to be called for a specific experiment and fly.