I am unable to duplicate this behavior on my board running 6.7.2 posting the phrase in a topic subject or post body. Can you be a little more specific as to where you are posting this particular phrase which returns the error.

I would advise upgrading to 6.7.2 at this point, not only to see if this is fixed, as I would assume that the new product upgrader is going to require you to be on 6.7 to function correctly.