OOPS!!! I spoke too soon. Really strange!! Tuner always works fine with IR. When turned on (via 12V trigger) for the first time, the RF works perfectly. After some time the tuner only responds partially or not at all to RF - but remains fine with IR. Occasionally, turning off the tuner will get RF working again for a while, but then the tuner no longer responds to either of the 2 RF programs I am using.

Is the Philips 6500 somehow stripping out something? I would blame the Polk, but the IR always works fine - ????

Craig