Org-mode export to html hangs when encoding links

[Brad Collins <brad@chenla.la>]

Since upgrading to 8.3.4,  exporting to HTML fails if there
is a hypertext link in the document with the following error:

   if: Autoloading failed to define function url-encode-url

This is the document that fails:

--begin--

#+TITLE: Testing
#+AUTHOR: Brad Collins 
#+EMAIL:  brad@chenla.la

* This is a Heading

Lorem ipsum dolor [[http://chenla.org][sit]] amet, consectetuer adipiscing elit. Donec
hendrerit tempor tellus. Donec pretium posuere tellus. Proin quam
nisl, tincidunt et, mattis eget, convallis nec, purus.

--end--

I'm running:

  GNU Emacs 25.0.91.1 (i686-pc-linux-gnu, GTK+ Version 3.4.2) of 2016-02-22
  Org-mode version 8.3.4 (8.3.4-dist @ /home/deerpig/emacs-lisp/org-mode/lisp/)

Here is the the beginning of the debug backtrace (the full
backtrace is 165k):

Debugger entered--Lisp error: (error "Autoloading failed to define function url-encode-url")
  (url-encode-url text)
  (if (fboundp (quote url-encode-url)) (url-encode-url text) (if (org-string-match-p (concat "[[:nonascii:]" org-link-escape-chars-browser "]") text) (org-link-escape text org-link-escape-chars-browser) text))

No luck googling and I've looked through the code but I can't figure
out where to even begin to look.  I couldn't get the Melpa
package to work -- so I'm running Org from a local install
from Git.

Any ideas?

Cheers,

b/

-- 
Brad Collins <brad@chenla.la>
skype|twitter: deerpig
http://chenla.la