In IE 8 - DayPilotCalendar (7.0.2638.0) throws JavaScript exception on post back from other controls (combo box in my case) and breaks. All subsequent post backs shows same error.
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E; .NET CLR 1.1.4322; BRI/1; Tablet PC 2.0)
Timestamp: Mon, 17 Dec 2012 16:11:07 UTC
Message: Unable to get value of the property 'cells': object is null or undefined
Line: 2
Char: 34781
Code: 0
URI: http://localhost:57898/WebResource.axd?d=NTMLRrOG1Jt7zZYZ7rVO1dlQ_roSvB6pvfn0hrC9DnEwUDPNpvByPYamASS1tvoIq_TkNkF3bTtSwznSW0cRt_9CPsa2pxHQRlWfrZ-O2LpQ54O9xPU3NGU6GgK11y9eHDEE-mKWyA0DKqHjShfICw2&t=634819680000000000