I just pulled and I get the attached backtrace from org-agenda-list.
I tried with -q -l minimal.emacs and it's still there.
It's probably caused by commit 42691788273cecb75ec620d40cc5394d2cd95ed1.
When I revert that, the agenda comes up properly.

Org-mode version 8.0.5 (release_8.0.5-334-g1b1469 @
/home/nick/elisp/org-mode/lisp/)
(which includes the revert: the real one is -333-)