If the *exact* same experiment folder & input file creates all the data files properly on one computer but not another, it could be a user permissions or read/write permission issue. When logged on under your usual account, are you able to delete that voice folder? Change the name of it or even delete the whole data folder altogether? If you place one of the sample input files that comes with DirectRT into the same folder with YOUR input file--do the data get saved for that sample?