It probably has something to do with this thread: http://lists.gnu.org/archive/html/emacs-orgmode/2012-02/msg00473.html
That thread was about auctex prompting for the master file name every time an org file is opened. On 26 October 2012 10:43, Christopher Schmidt <christop...@ch.ristopher.com> wrote: > Suvayu Ali <fatkasuvayu+li...@gmail.com> writes: >> I believe the reason was to get rid of auctex prompting for the master >> file name every time an org file is exported to LaTeX. > > The default value it t anyway. The docstring suggests that this > variable should be set via file variables. I do not think org-mode > should worry about AUCTeX. > > Christopher >