[edited from support email, related case]
We have just recently found a bug (see above) that may explain this.. it seems to happen when a pop-up message box is active on the screen at the very same time that the time limit for a questionnaire expires. This causes a conflict because MediaLab trys to shut down the questionniare but can't--because a message box from the questionnaire is up on the screen. We have so far fixed the problem when it occurs during fill in the blank and scale responses--if you want to check it out, this new release (2006.2.26) is posted here: www.empirisoft.com/download.aspxWe ran 12 people in total so far, but for two of them we did not get any data. What happened was that both of the problematic cases ended with the math session while participants were running out of time. when the time limit was up (or close), a small window popped up on the screen saying "run time error" (at least for one of the two cases) and when the participant clicked "OK" on that small window, it automatically closed Medialab, and none of the data from any one of the three tasks were saved in the "data" folder.