This is a real wild card, since I'm more of an artist than a tech, but Remy had this suggestion to a similar but not identical issue a while back. You could try this?

I recommend closing CC3 and running that exe file from the directory.

You're welcome :)

If you need more detail about it Remy wrote a FAQ on it here:

https://forum.profantasy.com/discussion/comment/99096/#Comment_99096

I believe it is either the same, or has some of the same content.

Tech Support is aware of your issues and is currently working on resolving the problem, however there may be a slightly longer wait than usual owing to the Christmas period.

Also, you might want to add a bit of transparency.

I often have a white grid with a dark glow and a bit of transparency so that it isn't too overpowering. Or I have a black grid with a pale glow.

Find out which sheet the map border is on. This is quite separate to any decorative element visible in the map and usually hidden somewhere underneath something else. The technical map border is often on the BACKGROUND sheet, but that's not a hard and fast rule, so to find it open the layers dialog and make the MAP BORDER layer active and hide all the rest. Apply, and you should see it. Then you can use List from the Info menu to find out which sheet the actual map border is on.

Once you know which sheet it's on, show all the layers again (except the TEMPLATE layer, which should be both frozen and hidden), pick another layer as active (BACKGROUND is good), and freeze the MAP BORDER layer to protect it.

For that Options checkbox to work you will need to have whichever sheet the technical map border is on visible.

That might be the maximum pixels per pass setting, which can miscalculate very large glows or edge fades if the pass is too small to capture all the information and cause these rather strange horizontal stripes.

Type EXPORTSETMPPP and hit enter, then check the number in the command line. The default value is 4 million. Type 40 million without commas or gaps and hit enter, then try the export again.

No problem, Ricko :)

Though the result is much better this time I can still see a very faint glitch across the middle of that map, so you might want to either reduce the size of the glow or shadow, or export at a slightly smaller size, because I'm not sure it is wise to go much higher than 40 million. (Maybe @Monsen would know?)

The relatively low default setting is so that people with less powerful computers can export without issue.

Thank you, AleD :)

Even with screen shots it's pretty difficult to work out what is happening here.

Maybe this tutorial by Dogtag will help?

https://forum.profantasy.com/discussion/6723

I had a bit of trouble with the text, when after concentrating on the look of the font, exploding it so I could fill it, and then getting the arrangement just right, I realised I'd missed out the T in Christmas! LOL!

But I did it again, and it looks much better now :)