bug#3674: 23.1.50; customising TeX-PDF-mode t makes Emacs.app fail to create AUCTeX 11.85 previews

[Peter Dyballa]

Hello!

The most easy way to reproduce the described behaviour is to launch  
Emacs.app with -Q and then execute/evaluate in its *scratch* buffer a  
bit of Elisp code:

        <extend load-path that the AUCTeX files are found>
          (load "auctex.el" nil t t)
          (load "preview-latex.el" nil t t)
         (setq TeX-PDF-mode t)

With the last line Emacs.app always fails to produce previews. The  
setting can also be made active for a particular buffer by executing  
the TeX-PDF-mode function. The interesting thing is that, when TeX- 
PDF-mode is nil in the buffer you can create a preview, when you set  
it to t you can't, when you set it to nil again, yes, you can again!

--
Greetings

  Pete

When in doubt, use brute force.
                                – Ken Thompson

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