http://bugs.winehq.org/show_bug.cgi?id=12045
--- Comment #24 from Alex Balut alexandru.balut@gmail.com 2010-05-20 17:43:35 --- (In reply to comment #23)
Probably doesn't affect the Metacity desktop manager, I'm using xfce 4.6.1 here. And as you say Metacity also handles window placement differently.
Regarding Metacity and window placement - I don't know if this matters, but last time the window appeared on the same screen as Foobar2000, as you described.