I can confirm this. Looks like the game has problems loading maps with more than 600 preplaced cities, but you can still found cities manually in the game and it works.
I'm getting the problem too, now. It only happens (for me at least) when I use the editor to manually place the cities, and the limit is still a fair bit higher than 512. If I build the cities normally, I'm getting no such problem.
Even if you get around that, your AI will be unable to build more cities beyond 512, even with this patch. Only the human player can continue building. Threw a huge monkey wrench into my mod development too.
Im playing with them lol, we had 512 cities before update and 770+ atm and I have built just 30.
But I'm still pondering the 600 pre-placed city limit, and if there are other ways to quickly count cities on the map other than with my finger.
That won't be an issue, as there is no city-building available for this specific game. As for your woes, Gojira, I do recall seeing Knuckles say:
Which leads me to believe that it is possible for your game, it's just a question of how.
But I'm still pondering the 600 pre-placed city limit, and if there are other ways to quickly count cities on the map other than with my finger.
Can someone post a quick tutorial on the install and how-to-use for this please?