Heh. Buying new FTDI chips from eBay to fix counterfeit problems is like using random bottles of liquid from your garage to try to extinguish a fire...
(Most Chinese Arduino clone vendors have abandoned FTDI (counterfeit OR real) in favor of the CH340g USB/Serial converters. An interesting change, since it shows that SOMEONE is capable of doing more than just stealing the original design.)
(I would love to here the inside story of how FTDI managed to decide their own chips were "not genuine." Sigh.)