The problem lies here:

A 2D polygon isn't a path, it is a polygon. When applying the river draw tool, which is a line-type tool to a polygon, you get weird effects. When a line has a line width, it is shown as a solid entity of that width, but when a polygon gets a line width, it is shown as a hollow entity with an outline of that width.

So why was in converted to a Polygon instead of a Path? This is down to the fact that the river isn't made up from just one series of lines, but they are actually doubled up. This causes CC3+ to see interpret this as a set of lines that goes all the way to the end and back to start again, so since it ends where it started it is interpreted as being a polygon. This means you get a very thin polygon, but a polygon still.

You can easily get this into the desired path by using the :CC2BREAK: command on it. Just place the start of the break at one end of the new "polygon" and the end of the break at the other end. This will basically remove one half of the poly, and leaving behind the line representing the other half as a proper 2D Path.

Have you remembered to add the Wall Shadow, Point Light Finalize effect? Lighting doesn't start working until this effect have been added.

And every citizen in every city prays it won't decide to come out and play with them.....

That problem occur if you just insert the house image into your drawing instead of the actual house symbol.

There are more information in the symbol than just the image, and CC3+ needs this information to generate a proper floorplan from the building.

The reason you have just a house image and not a house symbol in your map in the first place is most likely through the use of the :ICON_CATALOG: button. When you click this, you can either browse and pick a symbol catalog file (.fsc file), OR you can browse to a folder full of images, pick any image, and then have all the images from the folder showing up in the symbol catalog window. But if you do the latter (pick an image instead of symbol catalog when browsing) it means you will only get them as images, NOT symbols, because the extra information is in the symbol catalog file.

Instead, you should ALWAYS pick a symbol catalog file (.fsc), or just use the symbol catalog buttons in the toolbar as they will load the symbol catalogs properly.

Actually, that large tree in the top left looks to be a square to far to the left :)

Wonderful seeing these old maps converted to a more modern format (Although the old ones are nice too). Maybe some more furnishings in the rooms would be nice though?