Yes, all the above is true. As noted in an earlier thread, there seems to be a ground issue too. I've experimented with RF chokes with limited success. Ikaraus should have designed there USB adaptor with ESD in mind as people will be pluging and unplugging their Tx's. Humans can easily provide 2000 volts spikes. However, worse yet, is the charge on a Tx that can provide to the USB device and visa versa too!

My GreatPlanes (G2) USB controller works great, smooth, no glitches, but without the ability to program rates . On the USB cable, there is a choke installed two inches from the USB connector. My memory card reader has one too.

For Ikarus, adding resistors, between 50 to 200 ohms, helps significantly to reduce the effects of ESD zaps and EMI while having marginal effect on the signal. I technique I use on most of my IC designs.

Keep me posted as to your progess with adding resistors.

Cheers,
Greg.