[O] babel stopping export after updating to org 8.3

[Aviv]

Hi! 

I just upgraded to org 8.3 and am stuck with an export issue.

When I try to export a file with just "#+begin_src" and " "#+end_src" as the 
only lines, I get the error 
"user-error: No language for src block: (unnamed)". 

It seems like it is calling org-babel-exp-process-buffer -- but there is no 
reason that I can tell that is being called.  (org-export-babel-evaluate is 
definitely nil, thought other testing seems to indicate that shouldn't even 
matter)

I've tried this in a clean "emacs -q" emacs and there is no issue -- but I 
still have the issue with an empty init.el! 

Any idea what could be wrong?  Thanks!