In two different studies that I've run I've had problems with MediaLab freezing when an experiment participant accidentally hits the right-click button on the mouse.

It typically happens when a media file of some sort (either audio, video, or a still picture) is completing and MediaLab is moving on to the question after. It does not happen every time but sometimes, when right-clicked at just the right moment, MediaLab will freeze and not allow you to move any farther. In addition, it will not allow the user to force the end of the experiment (Ctrl-Alt-Right Arrow). Typically I have to open up the task manager and shut down MediaLab that way, and I then lose all data for the participant.

Has anyone else encountered this? I've started using a single-button mouse, but if something like this happens again is there a way to at least salvage the data that has been collected up to that point?