Could be a defect/mistake in the file system. Try to connect the Audya to a PC and run Windows scandisk on the Audya hard disk. If everything goes well scandisk will remove the corrupted file from the file system, so be sure to have a backup copy of the style itself.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.