Thank you for the feedback Jeffrey! You might want to try pressing the "Rebuild" button when you open the style picker from the plugin. It may be that the list generated by the plugin is not up to date and rebuilding will ensure that all the available styles are listed in the style picker.
RayL, I'm not sure if you are experiencing different behavior but the plugin is designed to not delete a generated file if it has been dragged from the plugin. So if you were to drag a generated track from the plugin into your DAW timeline, then when the plugin clears files, it will skip over whichever ones were dragged. Hope this clears things up!