So I've been having this problem since I recently updated to 5.2.0. My Wii U will consistently (but not always) freeze when trying to launch a Wii game. If it can make it past this point it runs fine, but I have not been able to find a guaranteed method to do so.
Everything else works, such as launching apps, virtual console games, and Wii U games. Entering Wii mode poses no problems either. It's just that 90% of the time trying to launch a Wii game causes the system to freeze on a black screen. Anybody have any ideas to fix this?