  Double Periodic Variables (DPVs) are hot Algols showing a long photometric
cycle of uncertain origin. We report the discovery of changes in the orbital
light curve of OGLE-LMC-DPV-097 which depend on the phase of its long
photometric cycle. During the ascending branch of the long-cycle the brightness
at the first quadrature is larger than during the second quadrature, during the
maximum of the long-cycle the brightness is basically the same at both
quadratures, during the descending branch the brightness at the second
quadrature is larger than during the first quadrature and during the minimum of
the long-cycle the secondary minimum disappears. We model the light curve at
different phases of the long-cycle and find that the data are consistent with
changes in the properties of the accretion disk and two disk spots. The disk's
size and temperature change with the long-cycle period. We find a smaller and
hotter disk at minimum and larger and cooler disk at maximum. The spot
temperatures, locations and angular sizes also show variability during the
long-cycle.
