I haven't played 7d2d in two years. My previous Steam launch command was defined as mangohud %command% and that worked fine. I use the OpenGL backend since Vulkan is still marked experimental, and doesn't work for me anyway.

With Alpha 21.1 I see a very small window briefly pop-up with with the mangohud UI and a background for 7d2d, then that closes and I get full screen game but no mangohud.

The game otherwise plays just fine, I just miss the stats.

Using --dlsym makes no difference and like I said, it shows in the first window and disappears with full-screen. I've tried with both windowed and full-screen mode.

Interestingly the Steam overlay FPS counter is not present either. I'm baffled.