Maybe you can check what are the settings for mathjax in your browser. Sage doesn't use png fonts by default and in fact the png fonts are not shipped with the mathjax in Sage. It uses HTML+CSS by default. I don't understand why it is defaulting to png in your case.

Maybe go to mathjax.org, right click on the math on top right and change the renderer to HTML+CSS. Ideally, changing the preferences there shouldn't affect what is used on the notebook, but it is worth giving a try.

On 07/03/2013 01:01 PM, Kevin Halasz wrote:
mathjax works for most webpages in the same browser (Firefox 21.0), as
well as all of the sage documentation in 5.2 and 4.8.

I think the problem is that the
file 
///home/khalasz/sage-5.10/devel/sage-main/doc/output/html/en/reference/groups/_static/fonts/HTML-CSS/TeX/png/imagedata.js
is missing. Is there some way to acquire it? I ran make ptest again
overnight/today, to see if that would alleviate the problem. The final
line of output from this command was:

make: *** [ptest] Error 4

I'm not sure what to make of this. Regardless, I again tried to build
documentation after this, and still had the same problem.

On Tuesday, July 2, 2013 12:29:32 AM UTC-7, Kevin Halasz wrote:

    I built Sage from source in virtual machine running ubuntu 12.04 LTS.

    When I try to build the reference manual and look at it, I get a
    [Math Processing Error] everywhere that there should be text
    formatted in tex math mode. I've tried doing a hard refresh (see
    
http://meta.math.stackexchange.com/questions/3627/why-is-math-processing-error-all-over-the-place-today
    
<http://meta.math.stackexchange.com/questions/3627/why-is-math-processing-error-all-over-the-place-today>)
    to no avail.

    I have noticed that a message flashes briefly on the bottom of the
    screen as the documentation loads. It says:

      File failed to load:
    
file:///home/khalasz/sage-5.10/devel/sage-main/doc/output/html/en/reference/groups/_static/fonts/HTML-CSS/TeX/png/imagedata.js

    I have looked, and noticed that no such file exists in my sage
    directory.

    I have tried the commands (from the directory ~/sage/devel/sage)

    (1) ../../sage -docbuild --mathjax reference html
         ../../sage -docbuild --jsmath reference html
         ../../sage -docbuild -j reference html

    all of which gave output that implied nothing was wrong

    (2)  ../../sage -docbuild reference latex

    the last three lines of output here were :
    [reference] writing... done
    [reference] copying TeX support files... done
    [reference] build succeeded, 11 warnings.
    the warnings worried me, but scrolling through the rest of the
    output, it seemed that none of them were related to
    .../reference/groups/_static

    (3) ../../sage -docbuild
    reference/groups/_static/fonts/HTML-CSS/TeX/png latex

    which gave the output
    [png      ] Error: Source directory doesn't contain conf.py file.
    which I can't make sense of, as I found several files named conf.py
    in the Sage-5.10 folder.

    Any ideas about what could be wrong here would be much appreciated


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