There have been a few reports of Dark and Light not loading, in most cases players have found if they wait often up to ten minutes the game will actually load.
You may also load the game more faster with the following method.
Locate the games files, this can be done by right clicking on the game in your steam library, clicking properties, local files and then pressing browse local files, from here click DNL/Binaries then right click on DNL.exe and press run as administrator. This has been reported to have fixed the slow launching of the game for many people.
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