Workflow variable containing HTML tags are not rendered correctly in Windchill PDMLink 10.1

     I want a workflow variable to be showed a  link ,and open in a new window when click the link.

     So the value is "<a href='url' target='_blank'>displayName</a>" , and the value should be displayed as "displayName" on the workflow task page.But the real value "<a href='url' target='_blank'>displayName</a>" is displayed in Windchill PDMLink 10.1 M020.

     When clear cache and restart Windchill , that's ok . After some time , that's not ok again. The Windchill running 6 MethodServers and 3 BackgroundMethodServers.