Created Unassigned: AjaxFileUpload Error IE7 and IE8 [27417]

After updating to latest April 2013 Control Toolkit, getting the following ASP.NET exception. Running Windows 2003 R2 and IIS.

Event Type: Warning
Event Source: ASP.NET 4.0.30319.0
Event Category: Web Event
Event ID: 1309
Date: 5/7/2013
Time: 3:03:55 PM
User: N/A
Computer: IBT-2800
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 5/7/2013 3:03:55 PM
Event time (UTC): 5/7/2013 7:03:55 PM
Event ID: d59bd963e0f447e0a375367cb5b29cb9
Event sequence: 58
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/1686273646/Root/MIS-8-130124268628101250
Trust level: Full
Application Virtual Path: /MIS
Application Path: C:\Buzz\iis_root\OLI\GardenAndGunClub\MIS2013\
Machine name: IBT-2800

Process information:
Process ID: 4872
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: Exception
Exception message: Invalid upload request.
at AjaxControlToolkit.AjaxFileUploadHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)



Request information:
Request URL: https://www.gardenandgunclub.com:443/mis/AjaxFileUploadHandler.axd?contextKey={DA8BEDC8-B952-4d5d-8CC2-59FE922E2923}&fileId=5ADA8FD3-EAFC-2D21-99FD-B2CBF6866D57&fileName=IMG_0770.JPG&usePoll=true&AspxAutoDetectCookieSupport=1
Request path: /mis/AjaxFileUploadHandler.axd
User host address: 207.99.40.148
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 15
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at AjaxControlToolkit.AjaxFileUploadHandler.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Custom event details:

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