Couple of questions regarding how much Iron the game thinks you're using and the English 'Ship of the Line'.
Weird things have happened over the last two games with both Iron and the SotL as England and America (Iron problems only for America) o' course.
I've noticed that with the last two games I've played (Civ V Vanilla), that if I'm receiving iron from an allied City-State then it doesn't add up with what my units are using.
Eg - In my current game (as America) the two little Icons showing Iron and Horses at the top left of the interface are registering correctly showing 0 Iron when I had 2 Trebuchets and now 2 Iron since upgrading to Cannons, yet the game keeps insisting that I am using more Iron than I have with the notification icons in the bottom right of the screen.
The game before this one, (as England) had me receiving 2 Iron when I had none at all, none from my land nor from any City State.
I happily took the free Iron though.
Also, before I had researched 'Combustion', the option to build a Ship of the Line went missing from the list of units available to build leaving the Caravel and Ironclad only. Luckily I had heaps of coal but still, the English Frigate/SotL is their special unit so it was pretty crap that I couldn't build one. I definitely had Iron by that stage so it wasn't a lack of resources and even if I had no Iron the unit should still be listed but not selectable/faded but it went missing altogether.
Has there been any updates via Steam lately?
It seems odd that the game would work well up until now but now suddenly start to exhibit bug-like behaviour.
(excluding the bugs that already exist and that I know of of course).
Thanks