Enable the algebra filter and tex filter.  Go to blog or course and create some content: Algebra: @@x+y@@ TeX: $$x+y$$ Click on the algebra expression (should go to a debug page) VERIFY: there is no mention of http://moodle.org/download/mimetex/ and that the text at the bottom of the page makes some sense. Go to the tex debugging page ($CFG->wwwroot/filter/tex/texdebug.php) VERIFY: there is no mention of http://moodle.org/download/mimetex/  and that the text at the bottom of the page makes some sense. Manually review the mimetexisnotexist string (this string is difficult to review in error log because it needs an 'invalid' PHP_OS..) VERIFY: the content of this string shouldn't reference to  http://moodle.org/download/mimetex/ . The exact string should only contain: 'Your system is not configured to run mimeTeX. You need to obtain the C source from <a href="http://www.forkosh.com/mimetex.zip"> http://www.forkosh.com/mimetex.zip </a>, compile it and put the executable into your moodle/filter/tex/ directory.'