Strange. Take a look in the folder: C:\MediaLab\Experiment Editor\Temp and delete any files in there. When creating or editing a que or exp file, the editor makes a copy of the file in that folder and edits it. Upon saving, it is supposed to replace the original. The temporary copy is supposed to be deleted after all this. For new files, the process is the same except that a blank file is created first since one does not yet exist.