This new SF i got when ever i open my map in X-tra its all

ed up. Is the only way to get this effect is if u have Null? Because there is a slim chance i used it on accident but if i did is the only way to remove it by going over the hole thing in straigh up black over again?
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Open it up with SF and try putting Null terrain 0-1 on it.
Check the backup file that SF automatically creates.