I did some testing as well last night, and found some promising (but also some very awkward) results.
You should go to the trade screen and look how much trade income you COULD get. For instance, at my town of Sardis, this was listed as about 2100, this should match the number which is displayed when you hover over the blinking icons, since hovering over the blinking icons gives you the total of what you have + what you COULD have. Now look at how much trade income you REALLY get (thus the static, icons). This is how much you really get. In my case of Sardis, this was about 1400
Now not down the difference, which in my case was 700. Go back to the detailed screen. There is one (or two combined or three etc) which match this EXACT amount. For me, this was Athens. Thus somehow the trade between Athens and Sardis was blocked.
I checked this with a different town, which revealed that that town had blocked trade with Jerusalem, which again matched to the number.
So I set out with my ships, and saw 2 fleets on the sea route. One was the Macedonians, and the other the Egyptians. Both of which I was Neutral with, but the Macedonians had Athens, so it would be weird if they blocked their own trade. Nevertheless, I couldn't check it, since both fleets were a lot bigger then me. But I suspect the Egyptians of the block (note that on the map there were still tiny whips going from Sardis to Athens, but the trade just didn't occur). Note that neither of the two ports were blockaded
Another strange thing I noticed yesterday is that I had a city which would get a DECREASE in trade income if I upgraded my port into a Shipwright. I honestly have no idea why this is, but I still have to finish the Shipwright and will post results after.
Bookmarks