"We have traced the issue to a driver problem with a driver from FTDI (interface chip in the ThumbDV). We have been able to duplicate the problem on other platforms with this driver. There is a technical issue currently standing in our way that has to do with the libraries that we use to build the radio software. We are currently discussing the next steps which may include asking if we can get FTDI to recompile the driver for us."Before they broke the waveform software link. I did 2m and 440 DSTAR with Transverters. Hope to do it again some day.