I have had this problem twice now. There was never a problem on my PC and only since I moved over to my new Mac. It worked after I had a good night's sleep .. go figure. But I need to type this time immediately as time sensitive medical typing. I have written to the company and had no reply. Have deleted the files from "recover old dictations" .. something I did not have to do in the seven years I typed using Express Scribe on my PC. No help. No time for a nap ..