Don't know how helpful this is, but I have installed two wireless Rio setups for friends that utilise Linksys BEFW11S4 router/AP and 3 WET11s. They both seem to work fine using tRio (alpha5), ARM 1.04 and a combination of Dell and Dell rebadged.
Is there some info about the configuration or set up that you would like to see to help with your issue? They both have about 3000 tracks in the database.

Cheers
M