Why decals disappears after hide > show component?

I made many tests with many animations assemblies with decalsinanimation and always decals disappearsafter component comeback to "show".Before hide it, too.

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Maciel Fernando Gabriel. / Brazil - SPSolidworks 2007 SP4.0
Video: 256Mb / Processor: Atlos 2,0Ghz / RAM: 1Gb / Win xpsp2SolidworksMotion Studies