With Chrome (20.0.1132.57 m) (clean install) I can't get it work.
With Firefox 10.0.5 ESR (disabled other addons) I saw it once, but after visiting the page a second time it was gone.
After deleting the cache,cookies,... I saw it a second time, but return to the page breaks it.
Deleting History a second time breaks all... can't get it work anymore :(
Edit: hmm I saw it a third time, but after return it disapear :(
Edit2: now I can see it on Chrome for one player on one server but on the other server it dosn't work.
Edit3: It works on a server without "live update" (FF & Chrome) on the other with "live" it dosn't work... is it possible to disable that as serveradmin?
Edit4: Hmm same "working" server: next map with "live update" - warningmessage disapear... Maybe a problem with the data from the Server with this "live update" view?
Edit5: Is it possible (if it works) to put the warning also on the "join"-button on the profile-page of a player?
By the way... thank you for the counter of the external list :)