In the MediaLab help files, the "Labels (Questionnaire Files)" page suggests that you can recode Multiple Response answers by adding a bracketed value (e.g., {2}) after the Text label.
However, I find that when I do this, e.g.:
I am a student {1}
I am a TA {2}
then "1" and "2" are always written in the .csv files, whether the item was selected or not. (The Response Time data shows whether an item was touched, but not the participant could have checked it then un-checked it.)
This seems like a bug, since the data doesn't allow me to distinguish between those who checked a box and those who didn't. -- Or have I misunderstood something?