dx12 in editor didnt want to work properly on mine right away either i just updated the gpu driver to the newest windows 10 and made sure to restart and works fine now, and since i tested this on a surface pro 2 its funny to see a few things actually being able to be playable in the editor that wernt when using dx11 haha, still has along way to go, if you do not clean install the gpu driver however you will get alot of gpu particles and stuff on the screen almost like a old VHS video that’s been damanged, But i cannot wait until dx12 exporting is avaible <3 thats the dream.