Here's a very simple ORG file: --------
#+OPTIONS: LaTeX:dvipng * Test file \begin{equation} x=\sqrt{b} \end{equation} ---------- When I export this to HTML (Org-mode version 7.8.11 (release_7.8.11-12-gc55405 @ c:/emacs/site-lisp/org-mode/lisp/)), the equation comes out blank. The HTML file contains the following code: <img src="ltxpng/test_660c6efb146974e9d77e2de45f258385867ef389.png" alt="\begin{equation} x=\sqrt{b} \end{equation}"/> However, directory ltxpng is empty. I'm running Emacs 24.0.97 under Windows Vista with MikTeX 2.09 installed and PATH set so that I can call pdflatex, dvipng, etc. from the command line just fine. Any thoughts about what might be going wrong?