Grid printing problems
When I go to print a map the grid doesn't print unless I really exaggerate it on the map, then it prints very faintly.
Here is a screenshot of how it looks in CC3
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screen1 by jimmilne2010, on Flickr
And a page as it prints out
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C:\Users\Jim\Documents\maps\Lone Rock Hideout.FCW by jimmilne2010, on Flickr
And the map file is attached if that helps.
Here is a screenshot of how it looks in CC3

screen1 by jimmilne2010, on Flickr
And a page as it prints out

C:\Users\Jim\Documents\maps\Lone Rock Hideout.FCW by jimmilne2010, on Flickr
And the map file is attached if that helps.
Comments
However, it's easy to control the width.
Unfreeze the HEX SQUARE/GRID layer.
Select Edit >> Change Properties... and click on the overlay
Type 0.05 into the Width box, OK
I've tried it in Creator and Adobe, and it prints out fine.