Hi Nicolas, I see that the org-e-beamer fails to use the beamer class when case-fold-search is set to t in custom-set-variables. So the header looks like this:
% Created 2012-07-24 Tue 18:20 \documentclass[11pt]{article} instead of % Created 2012-07-24 Tue 18:20 \documentclass[presentation]{beamer} Thanks, -- Suvayu Open source is the future. It sets us free.