Ensure that Mathjax filter is On and TeX is Off. Create a course. Enrol 3 students. Add a Lesson activity (use settings below). Flow control / Allow student review = "Yes" Flow control / Provide option to try a question again = "Yes" Flow control / Maximum number of attempts = "6" Edit the Lesson activity and Multichoice question page. Page title: Question with formula Page contents: Please choose your answer: Answer 1: $$x= \frac {17}{12} $$ and $$x= \frac{13}{12} $$ Response: good Answer 2: $$x= \frac{17} {12} $$ and $$x= \frac{13}{19} $$ Response: great Log in as student01. Select one (1) of the two (2) possible answers and click the "Submit" button. Result: Without the patch: You will see "Your answer : $$x= \frac{17} {12} $$ and $$x= \frac{13}{19} $$" With the patch: You should see the formula/notation rendered correctly Enable (set to On) TeX notation at Site administration / Plugins / Filters / Manage filters. Ensure Mathjax is On as well. You may use the same steps above. Result: Without the patch: You will see "Your answer : x= \frac{17} {12} and x= \frac{13}{19} " With the patch: You should see the formula/notation rendered correctly Case for image and mp3 files: Another testing case would be to use an image file and mp3 file in the Answer field. This should be displayed correctly as well.