On behalf of the Dolphin Emulator development team, I am pleased to announce the release of Dolphin 4.0, the newest major release of the most compatible and most performant GameCube and Wii emulator for PC.
While it only affects a few specific use cases of the emulator, we still consider this a critical issue and we will release a Dolphin 4.0.1 version fixing this bug. Single Core mode is not used for regular gameplay but is usually required for TAS and NetPlay.
Update: a few hours after release, a bug causing crashes with Windows 圆4 and Single Core mode was found by testers.