Ok, I just installed a copy of 2.2 and turned on the Tex filter.
Debug gives me this:
h: /home/hscomp/public_html/filter/tex/mimetex.linux:Permission denied
The shell command "/home/hscomp/public_html/filter/tex/mimetex.linux" -e "/home/hscomp/moodledata_spring12/filter/tex/9608176195573c30c6beb3cf078fdf66.gif" -- '\Large f(x)=\int_{-\infty}^x~e^{-t^2}dt' returned status = 126
File size of mimetex executable /home/hscomp/public_html/filter/tex/mimetex.linux is 830675
The file permissions are: 100644
Now this works just fine with Moodle 2.1. What changed with the Tex filter between moodle 2.1 and 2.2?
Thanks!