USB CDC UART is recognized as Teensy COM port.

The comport generated by the USB CDC UART example  is showing up as a comport; However when I start sending something my terminal program is crashing.

When I look in the device manager, that comport is listed as a "Teensy comport".

So there must be something wrong on my PC (windows 7).

Any tip or hint on getting this solved is highly appreciated, thanks, Karel.