msev:
Did you swap them because of the pinout on your arduino, or because the board was mislabeled (that rx was labelled as tx?)?
My Arduino board uses the standard FTDI pinout if that helps (I only bought the CP2102's to test). I believe this board actually has RX/TX marked correctly since with my other TTL/USB adapter also crosses TX/RX.
FWIW,
Brad.