Im also having the same problem, I have tried your method and it still doesnt work.
My problem is everytime i transfer/copy music files (mp3) directly into my external 32gb sd card even via kies it goes "file format is not supported" something along the lines of that. But when I copy music directly into my internal memory or through kies it was perfectly with ablum art, artist, ect.
So I then tried to transfer music from my phone to my sd card, then files get a bit corrupted. All the songs will have the same album art, unknown artist and the songs will skip every couple of seconds.
I've been trying to look around the forums with people similar to my problems until I saw daemolition who had the exact same problem, except the method you gave to him still wouldnt work for me.
Im really disappointed and that my 32gb micro sd card is going to waste. Could it be memory card? or the SGS2 is really crap of knowing how to work a sd card properly.
I would find it hard to believe its either! As I have these problems on an SGS (not 2), and I doubt so many people would have issues with memory cards?!