Thanks for replies. (Haven't been notified vie email.)
Last time (a couple of weeks ago) I've tried Razor-qt it hasn't worked, but what I'd really like to have is a Qt-only Openbox system. So I remove all Razor things and use just Openbox.
Anyway I can live with the current glitch if fstab approach doesn't work well.
On a side note, when will Razor-qt edition be released?