You've done a great job :)

To be able to save new settings in FT3 you need to have opened it by right clicking the icon and picking "Run as administrator" This is because the folder FT3 wants to save the settings is a protected system folder and you need to have administrator access to save in it.

Ralf did a Live Mapping session on this just last week here:

Hi Jason :)

I'm much more of a City and overland mapper, and have only once used Cosmographer, so I'm probably not the best person to answer your main question. I just wanted to encourage you to create new assets. After all - once you've done it once you won't ever have to do it again, no matter how many maps you make.

Hit the hourglass button on the left and check the box that says "Effects are on when loaded", then save the file.

For the dashed grey line issue, first check that they really are on the sheet you think they are on by using List in the Info menu. If you are using a drawing tool to draw those lines the tool will dictate which sheet they end up on regardless of whichever sheet you have active at the time.

All seamless textures have repeating patterns in them. But there are a couple of ways of disguising this.

The first is to scale the texture so that it is not repeated as many times in the visible area. Be careful that you don't make the scale so large that the textures pixelate in the final output.

The second is to add patches of the partly transparent textures (DD3) on a new sheet above the terrain or ground sheet, with a nice Edge Fade Inner sheet effect on that sheet, or patches of a similar texture that is related to the first on it.

I haven't given you very much detail because there is a chance you won't need to do either of those things. If the map is still in an early stage of development with large blank areas the simple act of adding buildings or details may hide a lot of these things.