Symptoms
SmartForm exposed via Web Part causes impersonation error
Diagnoses
We have a SmartForm embedded in SharePoint using a Web Part. Windows Authenticated users access the SharePoint page and click a button on the SmartForm that invokes a K2 Process. That Process, when executed, throws errors like the one attached. The only band-aid we have is to give users of this form Impersonation rights on the Workflow server, which is something we prefer not to do. Any help you can give would be greatly appreciated.
Resolution
There is an impersonation bug in blackpearl 4.6.7, of which our Labs team supplied a fix.