I should have said, I don't have a Rio Receiver remote.

Not sure what you mean when you say "The RIO works with the RIO remote and my Slimp3 works with it's remote."

Do you mean the Rio Receiver, running slimrio, works with the Rio Receiver remote or it works with a squeezebox3/slimdevices remote?

Looking at the source code, slimrio includes the slimdevices IR codes - yet it doesn't work for me using the slimdevices remote.

A simple nc and then killing slimrio and running 'cat /dev/ir' doesn't show anything (so I'm guessing a HW problem).