MyMusic is the cure?!
I just discovered that entering MyMusic (I configured it to use WMP and visualization on) suprisingly fixes the problem (latest CVS)!
Also, if you press "!", you can see the vertical line moving: if it looks perfectly "straight" then you won't be able to minimize/exit fullscreen, if it looks "jagged" then you can.
I believe this is related to "Exclusive DirectX mode", since there is no problem at all if I disable it (but then tearing appears in videos).
I just discovered that entering MyMusic (I configured it to use WMP and visualization on) suprisingly fixes the problem (latest CVS)!
Also, if you press "!", you can see the vertical line moving: if it looks perfectly "straight" then you won't be able to minimize/exit fullscreen, if it looks "jagged" then you can.
I believe this is related to "Exclusive DirectX mode", since there is no problem at all if I disable it (but then tearing appears in videos).