Are you using JSGME? If your computer is running Windows Vista, make sure JSGME has Administrator privileges so it will work correctly.
The best way to ensure things work smoothly is to make your modified Campaign_LND.mis file JSGME-compatible and then enable it after any other add-on mods that affect the Campaign files, such as the GWX Black Sea Campaign. Otherwise, your file will be overwritten by those mods if they're enabled after yours.
You'll receive a warning from JSGME, something like "Warning! Possible conflict. This mod changes the file Campaign_LND.mis, which has already been altered by blah,blah...", but that's okay because you want to override any other mods with yours so the changes you made will be there.
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Still sailing the high seas, hunting convoys with those who join me.
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