Chris - N0CC
I tried as you suggested but it had no effect on the spectrum waterfall display. It stays blank. As I told Dave, things go back to normal when I don't load Win4Icom and reset the port to Com4. It's really not a deal buster, one waterfall is really all that's needed but I'm curious. I think once I've dealt with this I may try the Icom IQ output addition.
Thanks for the suggestion.