Are you using just the stock Rio software or are you using tRio or jreceiver, etc?

As to .ARFs an example of one combination that will no work is the rebadged Dell will only work with the 1.04 Rio version of the .arf file.
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[3 rebadged Dell DARs, 1 Rio Receiver] [JReceiver 0.2.5 and tRio 0.1.6 on SuSE 9.3 Pro]