I've a meeting recorder at 11:00 on 23/12/2013.
I tried to create an other event at 9:20 on 23/12/2013, duration = 0:45. Normally it should be possible as this event ends at 10:05...
But WebCalendar says that this is not possible because the event at 11:00.
Versions used : 1.2.6 and 1.2.7. Same behaviour.
Please see the screen shots in attachments.