A clip whose end landed before its start — a button saved with Time Up −10 hands every app start = press, end = press − 10 — is now stored the right way round on every save, and existing markers are put in order on update.
The Angles export gives every marker a sensible clip window. A reversed pair used to collapse to a zero-length clip; a marker with only a start now exports start to press, only an end exports press to end, and a point marker gets five seconds either side.
The markup button form explains Time Down and Time Up (seconds relative to the press; negative Time Down reaches back).
