Hi,
it give a Problem on the top left of the Screen. I have your Mod and TerraMap 1 to 1 in my folder and a little bit other Decomods but in your newest Mod versions give it one big Bug what the Screen to 1/12 with a white square covered show the Picture. I hope you can fix it. Why so can I not play.

Hello, this is an intended feature, it's a minimap. You can configure it (change it's size, disable it entirely, etc), in the Terramap's config. Terramap isn't really useful on a superflat world, it is supposed to be used on a Terra121 world. That's why your minimap is blue, it is centered onto the ocean at 0 0.

Here is an example image of the minimap in action on an Earth world (the minimap on the right is from an other mod (JourneyMap)):