The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Would be cool to have a default background for the client.
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Cause right now it's a soul-crushing grey. I personally like to use https://media.moddb.com/images/mods/1/16/15914/Cybran_ACU.jpg for mine.
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We had the one you linked as default and receive a lot of negative feedback, so we move to a neutral color instead