I have seen several posts that seem to indicate there is a problem with the latest version of the FTDI drivers.Several people have reported they were able to fix the problem by reverting back to 2.08.24, see the attached post:http://forum.arduino.cc/index.php?topic=165310.msg1238147#msg1238147
The modules will work with the previous driver as noted earlier in this post - but we will, of course, accept returns. We are locating an alternative supplier that uses genuine FTDI components.
I bought some CP2102 modules from e-bay a while back, they came with a mini-CD with drivers.Never had a problem getting FTDI drivers from www.ftdichip.com.Mine are from late 2010, I've not seen any problems.I bought some of the oddwires USB/Serial adapters, will have to fire them up & confirm they work.
The reset pin on the adaptor header is connected straight into the CP2102 chip, so