Stephen Brennan <brenns10@gmail.com> writes:

> When tikz is included and preview-buffer is run, the first math preview
> after `\newpage' will have a blank preview image.  The subsequent image
> will display the preview for the previous math expression, and so on.
> For example, with this input file:
>
> --- BEGIN EXAMPLE FILE
> \documentclass{article}
> \usepackage{tikz}
> \begin{document}
> $x^1$
> \newpage
> $x^2$
> $x^3$
> \end{document}
> --- END EXAMPLE FILE
>
> The preview for $x^1$ displays properly.  The preview for $x^2$ displays
> a blank image, and the preview for $x^3$ displays an image of $x^2$.  If
> you comment out the `\usepackage{tikz}' or the `\newpage', the previews
> run correctly.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.  And sorry the premature mail I sent.)

This is what I get with a recent AUCTeX and Emacs: