Downloaded maps = no grounds?

[Hephaestus]

Hi,

All the custom maps I downloaded (notably Ladios' Slate Pack, and some of JayDee's maps) don't have grounds. Like in the Slate Ocean edits, I can't see the water.

What's going on?

Thanks.

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[Zlovicha]

This happens randomly at times and you must change the map to another one then switch back