Sorry about your job. Hope this situation normalizes soon so people can get back to their jobs, or at least have an easier time finding a new one when not everyone is trying to hunt in the same limited pool.

At least the time isn't wasted when you spend it mapping :)

If it only happens when the effects are on, it is probably one of the effects on that sheet that has to large a size.

If you can't spot the guilty one immediately, try disabling the effects on the sheet one by one.

And also make sure your floors are on the sheet you believe they are, you can check this with the Info -> List command.

Looking nice, but have you considered some kind of coastline effects on your map, there is a very sudden jump between land and sea, nothing that provides a transition. Often a simple outline or glow is enough.

Well, as the Tome itself states in the introduction, it is written for intermediate to advanced users. It does assume some knowledge of the basics of cc3+, and relies on the user having worked through the tutorials in the manual first, and probably worked a bit on their own before diving into the Tome.

Also understand that the tutorial is written for that particular map in mind, it is extremely difficult to figure out all the ways a user may want to do things differente from the tutorial and reference those, that would also make the tutorial extremely bloated. The goal of the tutorial is to teach the user various techniques based on the requirements for that map.

Are you selecting the lines correctly? I just did a quick and dirty import following the steps in the guide, and I had no problems trimming the entities.

However, what can be confusing when doing this is:

• The Rivers/Roads when exported from the Watabou site actually consists of multiple lines on top of each other. CC3+'s trim tools work on one line at a time, and even if that line has already been trimmed, it is still a valid line so you can end up basically trimming the same line multiple times, which doesn't really give you any progress.
• Remember that thick lines are still selected by their centerline (this is where the actual line is), not by the edge as a polygon would be