Its not bug - just a change in feature.
Scheduler wont care at what time the task was "supposed" to start, but whenever the task does start, it'll repeat it every xx minutes for a duration of xx hrs from THAT instant - when the task did start - irrespective of its *actual* start time.

Try setting repeat every 1 minute for a duration of 5 minutes. And set the starting time couple of hours earlier than current time and manually start the task - it'll repeat itself every next minutes four more times - just as expected.

I had same trouble, then I saw this :
[URL="http://img140.imageshack.us/img140/2843/aftertriggeredet6.png"][IMG]http://img140.imageshack.us/img140/2843/aftertriggeredet6.th.png[/IMG][/URL]