[v4.61]
A MIDI clip with a Rate > 1 does not loop correctly in the MIDI Editor.
Try this:
(a) create a MIDI clip with a few notes in it
(b) change its Play Rate to > 1 (either by Alt-dragging the right-hand edge or in Item Properties)
(c) open it in the MIDI Editor and set Loop mode
(d) click Play
The Play cursor will jump back to the start before it reaches the end of the clip.
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Report in Issue Tracker:
http://forum.cockos.com/project.php?issueid=5142