Well it stuck for me OK through any changes made afterwards and as this post was first made months ago I'm on a different box now so can't really help you. Best contact Technical Support at Rogers.
But since we are solving it ourselves, as I said, the back of the remote itself had the instructions:
1) Turn device on
2) Press device key (TV, DVD etc..)
3) Press and hold setup (LED blinks twice)
4) Press 9-3-1 ...
Now after that, I still would get a volume control in the top right where the MUTE message had been. I looked all around and found the original instructions from when we bought the remote and section C Program Your Rogers Remote said in the section "set your Rogers remote to control the volume:"
1 press the CBL button
2 press and hold SETUP until the CBL button flashes twice
3 press 9 - 9 - 3, the CBL button flashes twice
4 press the TV button. The CBL button will blink twice to confirm a valid selection
5 check your changes.. test..
6 if you see the digital set top box volume bar instead of your tb volume bar you were not successful, repeat from step 1
That's PRETTY MUCH what it says, anyway I'm a happy camper now and so happy I wanted to share the tips!