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I`m creating the rendering images (with a formulas) script for the web site, which is based on texlive. I have found that there is a security vulnerability.

For example, using the commands \include \input \openin \read \openout \write a user can embed in the document that is processed on the server ...

I tried to run the latex through ssh as a normal user myusername and it worked properly. Hence the problem was that the latex is called through php, who works as a module of Apache. What is the cause of the error? How to fix?

Do you still mean the same error as at the beginning of this topic? Yes of course. The same bug with missing fonts.

So it's just a user issue? Apparently, this is a problem of user access.

Permissions shout not be a problem during compiling.
You mean the compilation tex-document? I did not ...

Recently I tried to run the program through ssh as root and it worked properly!

What permissions are missing?

I'm calling the program latex as myusername (no root) on php by function proc_open(). The php runs as an Apache module.

I checked the /usr #find -mtime -1 -print . No recently modified ...

As you mean in "math text blocks", you could use \raggedright for the text which affects inline math too. For displayed math, you could use the fleqn option (flush left equations). I noticed, you tried the flushleft environment, which is similar to \raggedright. I already tried to use \RaggedLeft ...

There is such a code:
\begin{document}
\begin{preview}
$\frac{(1+mx)^n-(1+nx)^m}{x^2} = \frac{x^2\left( (\dots)x+ \frac{mn(n-m)}{2} \right)}{x^2} = \left( (\dots)x+ \frac{mn(n-m)}{2}\right) =\frac{mn(n-m)}{2}.$
\end{preview}
\end{document}
The result:
http://f6.s.qip.ru/f35S7e0A.png

As seen ...

Thank you for your response.

~# apt-get install lmodern
Reading package lists... Done
Building dependency tree
Reading state information... Done
lmodern is already the newest version.
lmodern set to manually installed.
The following package was automatically installed and is no longer required ...

Try loading lmodern as well.

\usepackage{lmodern}

Where should I download lmodern? I need to install it?

I have installed on Debian package texlive-full wheezy.

Tried so:
\documentclass[12pt]{article}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage ...

Hello everyone. Sorry for my bad english.

I installed Texlive on Debian 7. I tried to convert tex file to dvi by latex. The tex file has the following preamble:
\documentclass[12pt]{article}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[english, russian ...