If the symbol already exists in the template prior to the modifications, and has been there throughout (check Symbols in Map by clicking the left button above the symbol pane), the symbol will behave the same way it always used to with respect to which sheet it goes on.

To make it behave you first need to delete them all from the template by deleting them from the Symbol Manager, get the catalogue you just saved open in the symbols pane, and try again.

I'm not able to explain it either, but I created a new sheet called "Backing sheet" and copied the polygon from TERRAIN MOUNTAINS 2 onto it with no sheet effects. It seems to be ok now. Let me know if it stops working, or doesn't work as well as I first thought.

There are a lot of nodes on the end of your crosshairs, and if your coastline is more intricate than the one Ralf was using as an example in that video it will behave as you describe until it is pasted.

Perhaps an easier thing to do, rather than trying to move all those nodes around until you can get the cursor to the corner, is to type the paste origin in on your keyboard and hit return. That's 0,0 (zero comma zero).

Then right click to clear the crosshairs before you accidentally paste it a second time.

If you can't get rid of the layer is it really worth scrapping everything to start all over again?

Layers aren't anywhere near as important as sheets. Most of the time I completely ignore them.

You're welcome, Kevin :)

If you ask a specific question there is usually someone around to help, so don't get stuck simply because there seems to bo so much to learn. Also, if you've used the app before it comes back a lot faster than you might think.