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Spent two hours trying all I could find on here last night and nothing worked, always got the warhammer splash and then instant minimisation.
It turned out that the game wouldn't appear correctly because it was launching in a resolution below my native.

To fix it head into your C drive, users, you, documents and then go to the warhammer battle march folder.
Inside here should be a folder called profile which will be just called player, open the file called config in notepad and head down to the very bottom where it says (set ui_resolution) and put in what you want it to be.

Now it should work.