Hi, when playing with the beamer export, I found a small error in the :tag of the org-beamer-themes customization option. Attached is a fix and a related slight improvement. Kind regards, Jan Emacs : GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.21.0) of 2010-05-28 on gunhead Package: Org-mode version 6.35i