Hello,
I’ve realised that you have the option of [Decorations]
also in Dolphin emulator.
As I have my decorations in the general menu, I normally have it in [AUTO]
in the configuration per system.
If Gamecube or Wii systems have the decorations in [AUTO]
(or some decoration selected), the emulation won’t work. Decoration with a black screen appears and then quits.
If I change it to NONE, then it starts normally.
I suppose this is a bug.