Setting anisotropic filtering to 1x means that it's disabled.
Hmm... If anisotropic filtering at 1x doesn't help, maybe you could try lowering the internal resolution to native? I can't think of any other problematic enhancement you could have turned on.
To set Real XFB, go to the Hacks tab, uncheck Disable under "External Frame Buffer (XFB)", and change from Virtual to Real (unless Real already is selected). Aside from fixing video playback, this will force the output resolution to be the native GC/Wii resolution, making it mostly pointless to use an internal resolution that's higher than native.
Hmm... If anisotropic filtering at 1x doesn't help, maybe you could try lowering the internal resolution to native? I can't think of any other problematic enhancement you could have turned on.
To set Real XFB, go to the Hacks tab, uncheck Disable under "External Frame Buffer (XFB)", and change from Virtual to Real (unless Real already is selected). Aside from fixing video playback, this will force the output resolution to be the native GC/Wii resolution, making it mostly pointless to use an internal resolution that's higher than native.