I have been using a link containing elisp:(org-beamer-export-to-pdf nil t) to export the subtree as a beamer pdf. It used to work well, but after a certain update a couple of months ago (I'm using 8.3beta and I regularly update it), it stopped working properly. For example, when I click on the following Beamer link:

I get a tex file with one page with properties written on it.

Again, I used to use this link to generate subtree-only beamer pdf. Also, exporting manually (C-c C-e C-s l P) works well as well.

Best,

Joon