I solved the problem late last night. Turned out to be a virtual serial port conflict between Virtual Serial Port Manager. I had a pair set up for some unknown reason that conflicted with the port created by SmartCAT. As soon as I deleted that pair Log4OM worked perfectly. 73 Rick, W2JAZ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz To opt out of the Reflector: http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz