Topic: Style Sheet Folders
Those downloading the beta in zipped form should know there is only one style. The select dropdown for choosing styles in profile and admin should therefore be ignored.
It is recommended that you delete all the style folders except Oxygen which will remove the styles dropdown menu and prevent you from trying to select a non-existent style. The latest SVN version has had all the style folders removed apart from Oxygen for those who are updating their installation that way.
If you want to test the style select then I'm sure you will work out how to create another style by basically cloning Oxygen.