My sincerest apologies. I just saw a thread not 2 days ago where someone was having problems IIRC, with IR port #1 on an RFX9600. Thought this was same problem.
4 questions. 1) Are you running latest firmware on RFX9600? 2) Have you power cycled 9600 since you noticed this problem? 3) what firmware are you running on the remote. 4) What type of remote?
Here's the thread that I reference above.
[Link: remotecentral.com]