The shell command
"/var/www/html/moodle/filter/tex/mimetex.linux" -e "/mnt/moodledata/filter/tex/d49227eab88f7b8b3bf6a2d09a2306b9.gif" -- '\Large \Delta _{pq}^{q}=8620-8150=470'
returned status = 1
Image not found!
Please try the debugging script