After switching to emacs 24, each time I open a tex file, I was getting the error:
Error: Don't know how to compile nil
It turns out this is a well know bug. To fix it, you just need to change two lines in font-latex.el:
- (byte-compile (intern (concat "font-latex-" name)))
- (byte-compile (intern (concat "font-latex-" name "-make"))))))
+ (byte-compile (intern (concat "font-latex-match-" name)))
+ (byte-compile (intern (concat "font-latex-match-" name "-make"))))))
After editing the file, you need to byte compile font-latex.el.