I had this same problem after only a few days with the empeg, the rio remote didn't work but my old kenwood remote would, so I swapped the batteries between my 5 day old rio remote, and my five YEAR old kenwood remote and viola the rio remote works again, (thing is the kenwood remote does too) at least it works now.

eli
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Empeg 50gig MkIIa (stolen :'(, my baby) In an Impreza 2.5 RS-T -also (new additions to the family)- Empeg 10gig MkIIa Empeg 50gig MkIIa