Meant to be Seen

Using Nvidia 3d vision monitor and glasses. Game starts and can see the 2d Valheim title, patch notes, and menu options. Mouse pointer is invisible, but can scroll through main menu options. However, the game's graphics just show a black screen. Video card ramps up, so it's trying to render something. But no polygonal visuals at all. Tried both dx11 and dx9 direct modes. Same results.