Skip feature

I have the new Pace PXD01ANI reciever with the XR15v2RQ remote.  I was having problems whit the Previous equipment  taking to long to recognize commucations from the remote to the box. Since this upgraded equipment, I have been having problems with the skip feature that I had used successfully with the older set. Now, this feature works sometimes, and sometimes it does not. I can use this 30 second skip feature on programs that are on demand on the CBS channel, but then when I try using it on the NBC channel, I get the message that "This Program Does Not Allow That Option". Why would this feature work on one network, and not the other? This had me puzzled because this is equipment related, and not network. Any suggestions would be helpful. 

Thank You.