This is a problem on all of the demos as well as the most recent (2.3) version.
To recreate - click an event and click the calendar icon so you can see the details and adjust the time. Click the selection box for the hour. It starts at 00:00 up to 01:55, then recycles to 01:00 again. It does this repeatedly for all hours.
I’ve confirmed this with multiple computers/operating systems/browsers hitting the demos, so it isn’t anything I could have done.
It was multiple PCs. One was a Windows 7 box, the other a Centos 5.5 box. Both are set to Eastern time (America/ New_York).
The problem appears to have gone away. Could it have been related to the shift to Daylight time?? I don’t think it started before yesterday and yesterday was the day of the shift. And that would make sense - it counted up properly until 2:00 am, then at 2:00, it shifted back an hour and got stuck in the 1:00 hour.
I noticed something else, though. This was the Spring daylight time shift. So, if it was related to the shift to daylight time, it should have sprung forward an hour, not back, so this behavior shouldn’t have happened at all. (It would more likely have occured back in November.)