The "walaoke problem with overlay mixer verified" is a symptom of software obsolescence. While the fixes above work for approximately 60% of users (especially those on older laptops with Intel HD 4000 graphics), the other 40% will never get it working perfectly on Windows 10/11.
This is the classic "Verified but inert" failure. Why? The was verified during the initialization test . Walaoke tests by creating a small, 32x32 overlay. That passes. But when Walaoke tries to create a full-screen, scroll-tuned overlay (required for karaoke timing), the modern GPU's scheduler rejects the request because it conflicts with the Windows DWM's compositing. walaoke problem with overlay mixer verified