http://bugs.winehq.org/show_bug.cgi?id=10142
--- Comment #57 from Jaime jskartman@gmail.com 2010-06-19 17:41:29 --- (In reply to comment #51)
That's because utorrent hides itself when minimized (and switching desktops uses minimize on most window managers), that's expected behavior. You can disable minimize to tray if you don't want that.
If I use amule (native linux emule client) with minimize to tray option enabled when I switch desktops the window doesn't disappear, so the window manager is working fine here. But if I use wine + utorrent (minimize to tray enabled) when I switch desktop the application is minimized to tray. I think this bug is valid and not fixed.