I just updated from git (previous update on June 30 about 08:00 EDT) and 
had trouble loading emacs.

Attached is a backtrace for the referenced possible bug.

My .emacs has the following

; Babel set for when I get around to learning how to use it

(org-babel-do-load-languages
     'org-babel-load-languages '((awk . t)
				 (calc . t)
				 (C . t)
				 (clojure . t)
				 (emacs-lisp . t)
				 (latex . t)
				 (ledger . t)
				 (lisp . t)
				 (org . t)
				 (scheme . t)
				 (sh . t)))

If I comment out (scheme . t) - no problem loading emacs.

Set up Windows 7, home premium; c:/emacs/emacs-24.2
GNU Emacs 24.2.1 (i386-mingw-nt6.1.7601) of 2012-08-28 on MARVIN

Org mode version Org-mode version 8.0.3 (release_8.0.3-333-g8387b3 @ 
c:/cygwin/home/Charlie/elisp/Org-Mode/lisp/)
at /c/cygwin/home/charlie/.elisp/org-mode which is update using git

my .emacs does load the cygwin org-mode version.

Charlie Millar