This is a problem related to your graphics card, especially if you're using an integrated one. According to a blog post on the developer's website, these graphical cards are not supported or partially supported, therefore if you have one that matches the ones below, update your drivers or install Nox on a computer with a dedicated graphic card:
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Unsupported:
Intel G33/G31 Chipset Family
Mobile Intel(R) 4 Series Express Chipset Family
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Partially supported:
Intel HD Graphics 4000+(Intel Haswell HD Graphics – GT2)
Intel HD Graphics 5000+(Intel Haswell HD Graphics – GT3)