Well, I have installed a virtual machine inside my Windows 11. It was a Windows 7 (one of my favorites ) So I just decided to try MUGEN However, I got unexpected results.  WinMUGEN stays with black screen but at least sound can be listened. MUGEN 1.0 works fine and MUGEN 1.1 just sends an error message. I had the idea to change video renderer of my MUGEN 1.1 from "OpenGL" to "System" and it worked but a MUGEN 1.1 without using the capabilities of OpenGL doesn't feel like a MUGEN 1.1, you know.

Any possible fix for this issue? Thanks in advance.

The fact is that where I have the virtual machine installed MUGEN works perfectly for me using Windows 11. It is only when I use the virtual machine contained within that Win11 that the video fails or as you mention, it is an OpenGL issue... The virtual machine I mention is a Windows 7 and the only reason to want to have MUGEN inside the virtual machine is that some few characters, more specifically certain "cheapies" of WinMUGEN only work on Windows 7. I don't know how to activate OpenGL on Windows 7 when it is a virtual machine as such. So again, Any possible fix for this issue?