Running out of ideas here....
Let's try setting you up with a "clean" install of Dolphin. Under "My Documents" (or the equivalent in French), move the "Dolphin Emulator" folder onto your desktop. This way, when Dolphin goes to look for any game info, it will need to create everything again (and it keeps your old files safe on the Desktop). This way we can rule out any weird bugs that managed to get into your files.
Let's try setting you up with a "clean" install of Dolphin. Under "My Documents" (or the equivalent in French), move the "Dolphin Emulator" folder onto your desktop. This way, when Dolphin goes to look for any game info, it will need to create everything again (and it keeps your old files safe on the Desktop). This way we can rule out any weird bugs that managed to get into your files.