HDRadioPort is OBSOLETE!! dont not use, use radioport and RR version > June 2010
(dont have both in rr.ini, the newest RRconfigs, will correct it anyway)
all the other issues... you should post in the RR Skin forum
use carwings dynamic lite, to eval HD Radio...
i also fear, the dfx4.0 installer overwrites hd radio dlls..
reinstall RIDERUNNER afterwards!!!
also DFX4 will create issues with winamp, if you dont remove the kill winamp stuff
THATS WHY I SAID WAIT FOR DFX5