Symptoms

Application Error when accessing workflow in designer

>Xml_UnexpectedTokenEx]
Arguments: =,,5,186
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem.
See
http://go.microsoft.com/fwlink/linkid=1066638Version=5.1.30514.008File=System.Xml.dll8key=Xml_UnexpectedTokenEx
 

Diagnoses

Whenever workflows are accessed via designer an application error is prompted, and if clicked through the application hangs.

The error is attached to this ticket.
 

Resolution

Clearing the IE cache resolved this issue.