[Emacs-orgmode] 4.12 problem

[Scott Otterson]

When I type alt-leftArrow and am on a headline, I'm getting this 
minibuffer error message:

   Wrong number of arguments: #<subr set-match-data>,2

This is only happening on windows emacs 22.0.50.2.  I don't see it on 
Linux using the same .emacs and emacs version.

Any idea what could be wrong?

Thanks,

Scott