I can't figure out why I'm not getting trade routes with Charlemagne in the attached game. I only recently came back to Civ4 after a couple years off, so perhaps I'm missing a rule change. But we signed Open Borders several turns ago and it's too early for Merc. The roads lead at least down to Charlemagne's river, and even if there were a road problem, I've got Sailing. So why don't I have routes with him?