Trade Bug #1
Game is only tracking 9 trade partners. I have 11. The Diplomacy screen shows all 11 trade partners. The Trade screen only shows 9. The total Trade Revenue shown at the bottom of the Trade screen is the sum of the 9 trade partners shown. Canceling one of the 9 displayed trade partnerships does not make either of the missing two show up, it just reduces the number displayed trade relationships to 8. My trade revenue dropped when I added the 2 most recent parters (Genoa and Venice) because their relationships were worth less than the 2 they made disappear (Ottoman and Mughal).
EDIT 1
I had destroyed the trade port in Bristol, one of my earliest trade ports, and turned it into a shipyard. Since it was one of my earliest trade ports, and since my trade agreements with Mughal and Ottoman were two of my earliest trade partnerships, it's possible that destroying the trade port caused a bug where by I no longer had a functioning trade parternship with those two nations. It seems the bug may prevent other trade ports from picking up the slack.
EDIT 2
Destroying Bristol's shipyard and rebuilding the Trade Port did not resolve the problem. Canceling the trade agreements with Mughal and Ottoman, then obtaining them again did allow me to trade with them again, and for the revenue from those trade relationships to appear in the Trade window.
Trade Bug #2
The cumulative value for all trade partnerships shown in the Trade screen is more than the revenue shown under Trade Revenue on the National Summary page. Those two numbers should be the same, shouldn't they?
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