R2 Server Essentials - Office 365 tab causes Dashboard to crash

I have an R2 Essentials server up and running with Office 365 AD integration which all seems to be working OK. If I enable the Office 365 tab in the dashboard it seems to work initially and displays all the correct information but after about 30 seconds the dashboard crashes (then asks you if you want to disable the offending add-in when you restart).

I get the following 2 event errors:

Source: Application Error
-------------------------------

Faulting application name: Dashboard.exe, version: 6.3.9600.16384, time stamp: 0x5215cf5a
Faulting module name: KERNELBASE.dll, version: 6.3.9600.16408, time stamp: 0x523d557d
Exception code: 0xe0434352
Fault offset: 0x000000000000ab78
Faulting process id: 0x4a4
Faulting application start time: 0x01ced8cdc76d80c2
Faulting application path: C:\Windows\system32\Essentials\Dashboard.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll
Report Id: 22023c37-44c1-11e3-80be-001018303c36
Faulting package full name:
Faulting package-relative application ID:

Source: .NET runtime
---------------------------

Application: Dashboard.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Reflection.TargetInvocationException
Stack:
   at System.RuntimeMethodHandle.InvokeMethod(System.Object, System.Object[], System.Signature, Boolean)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(System.Object, System.Object[], System.Object[])
   at System.Delegate.DynamicInvokeImpl(System.Object[])
   at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry)
   at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry)
   at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
   at System.Windows.Forms.Control.WndProc(System.Windows.Forms.Message ByRef)
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Controls.AdminListView.WndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.NativeWindow.DefWndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.DefWndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Control.WndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.WmSysCommand(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.WndProc(System.Windows.Forms.Message ByRef)
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.MainForm.WndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.NativeWindow.DefWndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.DefWndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Control.WndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.WmNcButtonDown(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.Form.WndProc(System.Windows.Forms.Message ByRef)
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.MainForm.WndProc(System.Windows.Forms.Message ByRef)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr, Int32, IntPtr, IntPtr)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
   at System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
   at System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
   at System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
   at Microsoft.WindowsServerSolutions.Dashboard.Program.Main(System.String[])

Has anyone seen this? Any ideas?

Thanks