I have always accessed the drive by pushing the registration bank two buttons simultaneously. A complete menu comes up showing everything on the thumb drive. Styles happens to be near button "A", Songs is button E. I select "A" a menu comes up with choices to select the style file from. (Carl, Bryon, Gigs, etc. No matter which one I select, An Alphabetical directory comes up. like A - AL, OR TH -TO, ETC. When I choose one, no styles show up. This has never happened before.