http://bugs.winehq.org/show_bug.cgi?id=13633
--- Comment #4 from Frédéric Delanoy frederic.delanoy@gmail.com 2013-05-24 06:34:38 CDT --- (In reply to comment #0)
If you open vlc and switch to the second delivered skin ( Settings » Switch interface » Skin 2 ) and dragging it around it disappears after a while. Sometimes you have to drag it around a bit longer, sometimes it disappears if you move it a few pixels and release the mouseclick.
Tested with wine-1.5.30-221-gedb01d2 and VLC 0.8.6i (XFCE 4.10)
Like "A Wine user", dragging it around doesn't make it disappear (although it flickers quite a bit while moving)
If I try to move it to another workspace by dragging, though, it disappears, but that may be a WM issue.
Could you please retry if the issue still persists for you with latest wine (preferaby with another window manager)?