Thanks Dave and Rob! The upgrade is working perfectly now.
I had to re-trace my steps to figure out where I went wrong... In order to learn the signals from the original remote, I had to de-activate the extender and downgrade the configuration. Then when I installed the upgrade, I think I didn't re-activate the extender so the remote was acting weird... anyway after getting things back to normal, it is all working.
As a finishing step, I have uploaded the RMDU with the button descriptions added in case someone else might benefit from this:
https://www.hifi-remote.com/forums/dload ... e_id=26902
Thanks again for the help. Have a great weekend!
Russell.