you must have an open cam.
open cams take a lot of force to close and open, but don't offer the same kind of clamping force as some basic shimano or campy skewers give.
If you use a shimano or campy skewer, they'll hold a fixed gear rear wheel no problem.
even if your dropout is chromed.
I do have a shimano, it came as a set with the hub. The nut is stripped so I bought a completely new QR. And I only use a QR for the front.
I think I got it right, I'll take it for a spin and see how it goes.