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We report the discovery of an anomalous flare in a bright blazar, namely, PKS0208-512, one of the targets of the Yale/SMARTS optical-near-infrared (OIR)monitoring program of Fermi blazars. We identify three intervals during whichPKS 0208-512 undergoes outbursts at OIR wavelengths lasting for longer than 3months. Its brightness increases and then decreases again by at least 1magnitude in these intervals. In contrast, the source undergoes bright phasesin GeV energies lasting for longer than 1 month during intervals 1 and 3 only.The OIR outburst during interval 2 is comparable in brightness and temporalextent to the OIR flares during intervals 1 and 3 which do have gamma-raycounterparts. By analyzing the gamma-ray, OIR, and supporting multi-wavelengthvariability data in details, we speculate that the OIR outburst during interval2 was caused by a change in the magnetic field without any change in the totalnumber of emitting electrons or Doppler factor of the emitting region.Alternatively, it is possible that the location of the outburst in the jetduring interval 2 was closer to the black hole where the jet is more compactand the bulk Lorentz factor of the material in the jet is smaller. We alsodiscuss the complex OIR spectral behavior during these three intervals.

An Optical-Near-Infrared Outburst with No Accompanying Gamma-Rays in the Blazar PKS 0208-512