In a future version I am sure we will have a suspend and resume option, as well as the ability to go back and forth between questions without doing those questions over.

In the mean time, if you are familiar with the Advanced Features, you could rig the responses.xls file to create a suspend and resume type of result. You could create a special responses.xls file that tracks all your variables. If you end a session early--e.g., by pressing ctrl+alt+right, you will get a report version of the responses.xls file that you could use next time they come. On the subsequent session, you could copy their report and rename it "responses.xls" in the main folder and re-run the session. With a few clever skips, you could have MediaLab skipping over the sections they have already done, so that they start where they left off. And when they DO finish, you have all the data saved in the subjects' final xls report file. Not as easy as a suspend and resume but it would work.