I make sure to use GIMP for all of my maps, even ones I made waaaaaaaay back when.
I'm thankful that ya'll are trying to test the images yourself, because I honestly have no idea what is wrong. Perhaps my computer glitched up somewhere and maybe it is having an issue with FH? I used to be able to uninstall the game just fine, but for the past like 5 months or so I can't. I get a notification that something can't be found to uninstall it, I can't remember exactly what it says, I could probably screenshot it. But because of this I have to manually delete the whole FH folder, I searched through my Local Disk (C:) files and couldn't find anything left, but maybe there is something elsewhere?