Ihv Gui Mui 64 Access Denied -

Modern IHV anti-cheat or DRM drivers (NVIDIA’s NVFBC, AMD’s AGS) register as Protected Process Light. Their GUI tools, however, do not. When a PPL-protected driver creates a shared memory object but restricts it to only other PPL processes, the standard user-mode GUI is locked out. The developer intended a graceful fallback. There is none.

If you encounter this error, the solution is rarely "just run as admin." Try these architectural fixes: ihv gui mui 64 access denied