When I open space engineers via steam, the game runs, and I can even hear the music.
However it doesn't seem to open on the desktop.
Instead it opens up somewhere in the direction of the bottom right corner, but outside of the desktop so that I cannot drag the window back in.
Alt+tab also doesn't work, nor does rebooting or anything.
My OS is windows, graphic drivers are up to date and I didn't have any problems with other games.