Please excuse me for this inconvenience. I have inspected the issue once again and have attached here the update dll.
As for the issue it seems to be caused by the fact that when using such recurrence rule with daily frequency and interval 2 the rule that is generated and used by RadScheduler is a bit different:
SELECT * FROM ExpandRecurrence('DTSTART:20151021T080000Z' + Char(10) + 'DTEND:20151021T090000Z' + Char(10) + 'RRULE:FREQ=DAILY;INTERVAL=2;BYDAY=MO,TU,WE,TH,FR,SA,SU', '12/01/2015', '12/10/2015')
Hope this will explain the issue.
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