Hmm… I am browsing directories on my roku soundbridge (m500 v2.5.174) right now, using twonky media server. Browsing folders also works on the roku using Telcanto media server (and SlimServer, but I read somewhere that there is something very different about the way that SlimServer works with Roku). My interpretation was that this was a relatively new upnp feature, and that the support of this feature was very new for Roku, but the support for browsing directories does appear to be there on the client now. Am I not understanding something with that support?
FireFly Media ServerThe original FireFly Media Server