Son of a....
I spent, literally, 4 hours yesterday trying to troubleshoot a 3d Printer (Tinyboy 3D), with it not working. MProg from FTDI said the chip was fine (right vendor and product ID), but it just wouldn't work. I tried every driver I could find. Finally, I uninstalled the driver, disabled wifi, plugged it in, waited for Windows 7 to install the version it knew (2.4 something), used Mprog 3.5 to reprogram the chip as legit (as per: ), unplugged, replugged (at which point windows reinstalled it again, with 2.4), and suddenly it started working! I can confirm this "Non Genuine" serial data, since I opened up the Arduino IDE and saw that on the serial console.
You know, I sympathize with FTDI. They're having their tech ripped off. But, it's inappropriate to punish end users who don't have any say. Sure, we could not buy stuff that uses counterfeit chips, but many sellers aren't even going to know. FTDI should be pursuing the counterfeiters in China, and using what legal system China has to stop it. Either that, or create a version of the chip that has such a low price point, they put the cloners out of business by providing legit-working-alternatives for a price point. So annoying that I've lost time because FTDI does this crap, and apparently Microsoft is okay with it (I don't see how this should have passed WHQL).