Running MDT 2012 on servers 2008 R2. When I trying to accessing the monitoring section of the workbench I received the following error:
System.InvalidOperationException: An error occurred while processing this request.
at Microsoft.BDD.Workbench.Utility.RunPSCommand(String commandString, Dictionary`2 parameters) at Microsoft.BDD.Workbench.MonitoringListView.Refresh()
The solution was to disable the proxy on the Internet Explorer. With this, the monitoring was running fine on the workbench console for the new server.
Thanks to Marc.