Using play panel
I often use the Play Panel to set a loop for 1-2 measures to check out different comping rhythms. So, my frustration concerns the fact that a play cursor jumps first to the beginning of the score then jumps to a loop in marker causing the whole score to jerk, and, I guess this jumping creates some delay, so the loop doesn't keep time. And this jumping also jerks the sound.
Also, if the last note of the loop is a note of a triplet it is not possible to set a loop out marker on this note - it goes into the next measure, so the loop doesn't play correctly. So, there are 3 in 1 unpleasant problems with the Play Panel.