NOTE: This is in Build 14 Beta 3 WIP 15
1. Started a new Master & Commander game
2. Went to sea straight away: several American and Spanish ships
3. They were all HOSTILE to me straight away, despite me flying an American flag
4. Check my Nation Relations menu
5. Now they ARE neutral
Can anyone confirm that?
Edit: Yep, looking at Nation Relations DOES seem to make quite a difference. On my second test, four out of six US ships went friendly again as soon as I did that.
I really need more information on what is going on here. Just did a test of my own:The false flag does not work well at all now. All it does is stop the forts from firing on you.
1. Started a new Master & Commander game
2. Went to sea straight away: several American and Spanish ships
3. They were all HOSTILE to me straight away, despite me flying an American flag
4. Check my Nation Relations menu
5. Now they ARE neutral
Can anyone confirm that?

Edit: Yep, looking at Nation Relations DOES seem to make quite a difference. On my second test, four out of six US ships went friendly again as soon as I did that.