The extender works perfectly and instantly with a simple USB flash memory. However, I run it with a "FTDI USB / Serial Device" on a 1m cable - and as you can the Failures per day simply no longer bear. To keep the extender running, you have either the WindowsDevoloDienst or - if it does not help - start the PC from scratch. This sucks immensely. A cable exchange did nothing. Just funny - sometimes it works for weeks without problems, but in this case only by the hour days or not at all. Too bad, because the normal function Devolo PowerLAN Adapter excellent. Also, there are not problems with a Win7 PC directly connected.