Is there a way to permanently delete old messages / locate points from the map?

Is there a way to permanently delete old messages and locate points from the map? It seems that I can only filter them... if I try to delete them (there is a little trash icon when i select the point or message) i get "An error occurred while processing your request." Or sometimes it will seem to delete, but then reappear when refreshing the view of the map... Is this something that "should work" but just doesn't right now, or am i asking it to do something it can't do?

I have no problem deleting old "tracking" files...