I got this setup recently. Everything works good with LG TV, but does not always work fine with Motorola DVR cable box.
MRF 260 is about 2 feet away from DVR, MRF switch is set to 1. I'm using only RF.
Everything is programed in CCP

Q1: I think IR blaster is disabled, since I'm sending commands trough RF, correct? I cant see any IR coming from MRF(using digital camera)

Q2: I copied VOL, and Mute buttons from TV page, to Cable page, so when I'm in cable I'm controlling cable. Seems like punch trough did not work. Can I setup punch trough for vol buttons to control TV while watching Cable? Because of that I had to setup Cable commands going to all RF gateway outputs, instead out going to Cable box flasher.

Q3: Trick with Menu, Power, Power worked for me as long as DVR received IR signals. Problem is, that even when flasher flashed, not every signal was recognized/received by DVR. For example: only one of two consecutive POWER commands, separated by 0.2 delay was received.
I tried IR set to max, min, and about half way on adjustable IR out of gateway. Any suggestions?

I found solution:
Signal level coming to DVR was too high. I had to turn level down and move flasher to cover only about 20% of opening(window for IR) in front of DVR. Did some experiments, and now I got 100% accurate control. Yes, I sat there, and sent over 150 commands controlling DVR, and no single failure!
DRV's are so picky!

DVRs in general require you to reduce the IR gain. That is why when using the 260 I always put the DVR on line 1 or 2. This is true for most DVRs we have installed. Glad you figured it out. Welcome to the world of RF control.