[edited from support email]

I have been collecting data in MediaLab all semester on one of my computers. When each participant finishes, it updates the csv, txt, and spss data files. When I opened these files last Friday, the files only contained the data we had collected in the prior week...all other data we had collected this semester are not in the data files. I had last checked these data files the week prior, and the files at that time contained all of the data we had collected thus far. How could this have happened?