Hi fellas.

Was successful at troubleshooting my SC4, got it to work in windowed mode with this:
-w -CPUCount:1 -CustomResolution:enabled -r1600x900x32 -intro:off

Naturally I wanna be able to use fullscreen mode, but for some reason (no matter what resolution), it doesn't work. All I end up with is a black screen which lasts for 1 sec, then I'm back at desktop.

Has anyone got any clue?

A work-around would be the Windowed Borderless Gaming tool. The game still runs in a window, but if you set SC4 to use your desktop resolution, the tool removes the window border and if necessary positions it exactly in the center of your screen, thus it looks exactly like fullscreen.