Brion-
The following commands must be available in the
default execution path
(PATH environment variable):
latex
dvips
convert
gs
and anything else that they depend on that I might not
know about. In
particular ask that dvips is installed, since you didn't mention that
earlier.
And as I just found out through two hours of pain, GhostScript in certain
versions doesn't work with ImageMagick at all. See this bug report:
http://ghostscript.com/pipermail/bug-gs/2002-July/001451.html
I used an older version (8.0 something) and it still didn't work. Only
going back to 7.05 did the trick.
One thing that helps in debugging is to edit render.ml in math/, remove
the "/dev/null" redirections, recompile and test on the commandline
according to the README. Then you should see exactly what goes wrong
where.
texvc is really quite terrible when it comes to error messages.
Regards,
Erik