I've recently bought the latest DLC called Gauntlet, and for some reason the new maps that come with it are not showing up in the map-picker, even though the files appear to be present in the game's directory.
I'm using the version from GOG, and I've tried re-installing the game and the DLC and verifying the installation. So far, nothing's working, even though the scenario that also came with it seems to be present and playable.
In your other post about this you say you have 24 maps both before and after you install Gauntlet.
I have 35 maps. Gauntlet adds 5 so I would have 30 without it. It makes me think you have not been getting the various free maps which have come with some of the patches.
What version of the game are you running?
Version 1.12, from the 27th of May 2016.
UPDATE 8th of June: I've tried reinstalling VCRedist and DXSetup, as described in the troubleshooting guide. I've also tried "The Purge", to no effect. I'm getting no error whatsoever, and yet the game just doesn't seem to notice the additional maps in its install directory.
UPDATE 2: Looks like a recent update have fixed my map issue! 
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