I cannot reproduce the problem. VLC asks for 80% opacity by default not for full transparency. And it works fine for me (Qt4.6.3 and KDE 4.4.7).
Make sure you have not configured opacity to 0 in the VLC settings.
I cannot reproduce the problem. VLC asks for 80% opacity by default not for full transparency. And it works fine for me (Qt4.6.3 and KDE 4.4.7).
Make sure you have not configured opacity to 0 in the VLC settings.