This is my first post and I registered because of this issue and how much I love Dolphin. I also searched and didn't manage to find anything exactly matching what I found to be the problem so if this is already known.. I tried searching. I am using Dolphin 4.0-4117.
In Twilight Princess I found 2 issues with the minimap, the first being anisotropic filtering breaks the minimap in D3D and OpenGL, the second being with with anisotropic filtering off OpenGL doesn't render the fade effect around the minimap properly. Force texture filtering was off for all of this, and for good measure I turned it on with AF and it didn't make a difference.
In Twilight Princess I found 2 issues with the minimap, the first being anisotropic filtering breaks the minimap in D3D and OpenGL, the second being with with anisotropic filtering off OpenGL doesn't render the fade effect around the minimap properly. Force texture filtering was off for all of this, and for good measure I turned it on with AF and it didn't make a difference.