Can you try this on Windows 10? There have been quite a few issues reported on Windows 11

Can you try this on Windows 10? There have been quite a few issues reported on Windows 11

Yes. Just tested and indeed it's running fine on Win 10. But the Win 10 PC I tested on also had a different GPU (GTX 1070Ti) with a game ready driver (the Win 11 PC is running a studio driver), so OS was not the only difference.

One more thing I noticed - when running on Windows 11, the V-Sync checkbox in both DX11 and DX12 seems to have no effect, the fps is permanently locked to my refresh rate. In Vulkan and OpenGL it works fine. And on Win 10 it works correctly in all 4 backends.

the Win 10 PC I tested on also had a different GPU (GTX 1070Ti) with a game ready driver

This is unlikely the driver. Nobody has reported this issue on Win10.

the V-Sync checkbox in both DX11 and DX12 seems to have no effect, the fps is permanently locked to my refresh rate

Yes, somebody else has also reported this problem. There appears to be quite a few issues on Win11, they should be fixed eventually.

Thanks. I have some more info about the crash. It happens in the SampleApp::Render() after the max frame latency change. Apparently there is some issue with the swapchain and now it returns a NULL RTV and DSV. The debug output log seems to contain some relevant info: