Jim,
This came in a couple years ago, and the problem was related to the number of styles stored in the HD's root directory, which is limited. Therefore, the solution is to create folders and move the files into folders, which if I recall from way back then, was limted to something just under 100 folders. Keep in mind, however, you can also create folders within folders, thus not overloading the HD's root directory.
The same problem exists, BTW, with the 3000s SMart Media Card, which also has a limited root directory.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)