Symptoms
Authentication error on picture control (Authentication Failed) in design/runtime.
Diagnoses
When adding a source picture to the picture control ,an error is raised "Authentication failed"
Resolution
giving the service account the right permission resolved the issue:
http://help.k2.com/onlinehelp/k2blackpearl/icg/4.6.4/webframe.html_Before_K2ServiceAccount.html
