In a few cases we have seen 1106 events in SCOM environments appearing. You will see those in the operations manager event log from the HealthService with ID 1106. These will have a text referring to RunAs accounts. For instance: Cannot access plain text RunAs profile in workflow bla bla bla.
So, here are some possible solutions to this issue:
http://systemcenterspartan.wordpress.com/2009/07/11/ops-mgr-event-id-1106/
http://systemcenterspartan.wordpress.com/2009/10/14/256/
http://thoughtsonopsmgr.blogspot.com/2010/07/how-to-get-rid-of-nagging-eventid-1106.html
