Tested with a brand new box. GTX 980, updated drivers. Windows 8.1. Ctrlaltstudio alpha 3 viewer works fine. DK2 sl viewer says:
"Cannot enter HMD mode because your graphics card does not support the minimum requirements. Vertext [sic] Shaders and Vertex Buffer Objects are required for proper rendering in HMD mode."
I thought I read that there was a way to bypass requirements detection, but I can't find it. Any suggestions?