Does MQX 4.0.2 CDC virtual_com run on the TWR-K20D50M? There a project for the TWR-K21d50m in the CW10 folder that I loaded and changed the linker\debug settings to the TWR-k20d50. It compiles and runs but when I plug in the VCP USB cable into a windows machine nothing happens. TWR-k2050d jumpers are in the default setting.