We have a customer that is experiencing a random problem when hovering over a entry for the QCalendar webpart.  The contents of the error state;

Exception=Sys.WebForms.PageRequestManagerServerErrorException: An unkown error while processing this request on the server.  The status code that was returned from the server was: 12030

Could this possibly be caused by ajax within the QCalendar webpart or something else?  Any assistance would be appreciated. 

Version QuickApps 6.3 / SharePoint 2010 / Server 2008 R2