I've found an horrible bug!!!
In Conquests, Spain messes up the starting locations: its location is exchanged with some other civs. Sometimes it's in Rome starting loc., sometimes in Greece, etc.
I tried everything, changing colors, even deleting and re-creating Spain...nothing to do.
This is a bug which Conquests introduced and it has nothing to do with my map but it happens in EVERY huge map with civs > 20.
The only solution I've found is un-assigning Spain starting location: it works if in the startup screen there's "ALL RANDOM" selected, but it WON'T work if the player is Spain.
Tomorrow I'll post the "definitive" versions, hoping that this bug will be fixed in next Firaxis patch. In the meantime I'll open a thread to make everyone know of this.