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Logfile from client shows:

ERROR Informa.ImageQuest.Client.Program System.InvalidOperationException: This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.

   at System.ComponentModel.BackgroundWorker.RunWorkerAsync(Object argument)

Close out of IQ Desktop

Delete the registry key below on the client for IQ

HKEY_CURRENT_USER\SOFTWARE\Informa Software\ImageQuest\Client

Then start IQ Desktop