  Recently published observations of VY Scl stars in their low,
long-intermediate and high states confirm our model (Hameury & Lasota 2002)
according to which accretion disks in such systems must vanish when their
temperature corresponds to thermally unstable configurations. An observational
confirmation of the hypothesis that the disk disappearance is caused by
magnetic effects would have important consequences for cataclysmic variable
evolution models.
