Mathematics tools

Hi, I'm using mimetex on a ubuntu server edition. It doesn't work because moodle show on the posts only a hypertext with my "latex script" to the texdebug.php page.

If I use the test page it works well. I can see the image and I can see the file gif on the directory .../moodledata/filter/tex. But into moodle the process doesn't work.

I changed the owner and the group of web and moodledata directory in www-data, but I have the same problem.

In redhat I know that selinux have to turn of. I have to make something on ubuntu? Do you think it is a autorization problem on some files?

Thanks