Very few styles have matching overland/city/dungeon styles. The only ones that comes to mine is Jon Roberts (divided over several annuals with all of overland, city and dungeon) and Mike Schley, with the main set in CC3+ itself, and SS4/SS5 dedicated to dungeon and city. But it isn't the common approach. I guess partly because artists have their preferred environment, dungeon scale artist doesn't necessarily make city or overland map, and a lot of the styles from CC3+ is the artist adapting their existing style for CC3+.

That said, since a city, dungeon and overland style isn't linked together, there is nothing wrong for Sue to make an overland style for 2021, and a dungeon style for another year, like 2022. Both issues of spectrum had to go in the same year because just half of it would be a bit weird for the purchaser of only one of the annuals, but a city style is still fully usable even if you don't own the annual with the overland style. If there are any repeating files (like maybe some of the fills), they can easily go in both.

As for Sue's comment that it has to be a city style in between, I disagree. These are separate map types, and there are no reason all three have to be made. Nice, yes, but not required. Just look at the Mike Schley style. Overland was released with CC3+, SS4 Dungeons of Schley was released almost at the same time, while SS5 Cities of Schley was only released many years later.

It may be a hidden file, make sure you show those. If that file is missing, there are no cache, which should make the thumbs show up fine, although it takes a bit longer to open the dialog

I assume you mean "programdata" here and not "programfiles", as I can clearly see references to c:\programdata in your original screenshots.

You can't split your data directory like that. If you picked d:\ProFantasy as your directory during install, that's fine, but then you'll need to stick to it and keep putting everything there. CC3+ won't recognice the programdata directory in that case (it can only have one data directory), so anything you put there will be guaranteed to make red X'es, because all the templates and symbol catalogs refer to your data directory (which is d:\ProFantasy for you)

The issues with the footprints is that every pixel are semi-transparent. The effects system doesn't like that too well. I initially tried to use them in my ice cave live stream as well, but got the same issue when adding effects. I think symbols like these is why DELAYDRAWSYM is enabled by default and you have to explicitly turn it off, because this causes them to be restored after the effects system have "lost" them.

Ouch, that looked worse than I would have expected.

Try using TRACED on it instead (Just type the command on the command line).

A positive offset makes it larger than the original. You can experiment a bit with the smoothing distance, but since the outline of this effect probably should be more smooth than the actual coastline, a value of 1-10 may be appropriate, depending on your map scale.