The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/7948cdc5b6f0787ddcd7a2a0438f18c7.gif" -- '\Large l \sim\sqrt{D\Delta t} '
returned status = 126
Image not found!
Please try the debugging script