SBS 2011 Essentials Dashboard crashing

What happens when you run "fix my network"

If you look at  C:\ProgramData\Microsoft\Windows Server\Logs\Dashboard.log it should tell you what the exact error is.

Also, try reinstalling (or installing -- if you haven't already) UR3:
http://support.microsoft.com/kb/2705117

Sometimes these UR's will repair components such as this.

Jeff
TechSoEasy

Is there a 'fix my network' option in Essentials?  If there is, I haven't been able to locate it.

As for the update - is there a way to do a manual install?  I do not see it listed in the installed update history, and it doesn't show up as an available update.  However, this server wasn't brought online until January 2013, so maybe the installation contained the rollups?

This is what I got from the end of the log file - no clue what it means, though:

[9936] 140130.151610.3620: Dashboard.Forms: !!!!FATAL: Dashboard shutting down due to unhandled exception: Exception has been thrown by the target of an invocation.
[9936] 140130.151610.3620: Dashboard.Forms: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Security.Principal.IdentityNotMappedException: Some or all identity references could not be translated.
   at System.Security.Principal.SecurityIdentifier.Translate(IdentityReferenceCollection sourceSids, Type targetType, Boolean forceSuccess)
   at System.Security.Principal.SecurityIdentifier.Translate(Type targetType)
   at Intel.SBMA.AddIn.PageAdorner.ConvertToName(String computerId)
   at Intel.SBMA.AddIn.PageAdorner.<CreateColumns>b__0(ListObject listObject)
   at Microsoft.WindowsServerSolutions.Administration.ObjectModel.ListColumn`1.Compare(TBusinessObject x, TBusinessObject y)
   at Microsoft.WindowsServerSolutions.Administration.ObjectModel.ListColumn`1.<>c__DisplayClassd.<System.Collections.IComparer.Compare>b__c()
   at Microsoft.WindowsServerSolutions.Administration.ObjectModel.Internal.ExceptionHandler.Run[T](ProtectedCallback`1 action)
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Content.PageContentExtension`1.AdornerHelper.<>c__DisplayClass3.<GetColumns>b__1(TBusinessObject x, TBusinessObject y)
   at Microsoft.WindowsServerSolutions.Administration.ObjectModel.ListColumn`1.<>c__DisplayClassd.<System.Collections.IComparer.Compare>b__c()
   at Microsoft.WindowsServerSolutions.Administration.ObjectModel.Internal.ExceptionHandler.Run[T](ProtectedCallback`1 action)
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Data.ColumnComparer.Compare(Object x, Object y)
   at Microsoft.MidMarketServer.UI.MultiSortOrderComparer.Compare(Object x, Object y)
   at Microsoft.MidMarketServer.UI.ConsoleListView.CompareFunc(IntPtr lparam1, IntPtr lparam2, IntPtr lparamSort)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at Microsoft.MidMarketServer.UI.ConsoleListView.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at SendMessageW(HWND__* , UInt32 , UInt64 , Int64 )
   at Microsoft.MidMarketServer.UI.ConsoleListView.Sort()
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Controls.ListViewGroupItemManager.EndUpdate()
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Controls.ListViewItemList.ResumeUpdates()
   at Microsoft.WindowsServerSolutions.Dashboard.Forms.Controls.AdminListView.listViewWorker_WorkComplete(Object sender, WorkCompleteArgs e)
   --- End of inner exception stack trace ---

Any ideas?
I've looked high and low for an option to fix or repair the network, but find nothing.  I've looked at repairing the console (dashboard?), but the only thing I can find there is also the 2011 standard version, and those instructions do not seem to apply to Essentials.

Is there any chance that re-connecting the computer that was deleted might allow the dashboard to reconfigure itself correctly?  Or am I shooting in the dark with that?

Thanks!

Is there any chance that re-connecting the computer that was deleted might allow the dashboard to reconfigure itself correctly?  Or am I shooting in the dark with that?

I would say yes there is a chance because the SID if not correctly deleted can cause the Dashboard to crash.

Reconnecting the deleted computer did not help the situation.
However, Jeff's solution worked.  I've got the Computer add-in visible again, although I wonder if I should try and delete the computer again that I was trying to remove from the list?
Thanks!