STR:

1) Using the console, deploy an ear (e.g. the attached one)
2) Click it, go to controls tab
3) Invoke the Restart operation until you get the error:

javax.el.PropertyNotFoundException: Property 'statusMessages' not found on type org.jboss.seam.Namespace

See attached log.
This is a bit rare use case as you need to click really fast. But the root cause might cause problems somewhere else, esp. for customers with slower machines.