Thanks! Yeah, it's usually not wise to update if you have an ongoing game. I should probably note if a new revision breaks savegames - but sometimes it's hard to predict. Ottoman stability was improved recently. They get less instability from Christian religions in their cities, as part of their Janissary UP (I think it was added for 1.4). The AI does significantly better now, but for the human player stability is still too hard. The difference is that the human player goes for the UHVs, while the AI takes it's time, and expands more slowly. So I agree, some further adjustements will have to be made. Maybe something along the lines of adding extra stability on the conquest of Constantinople, along with a cool new flavor popup? The palace is already moved there.