See previous post:
http://www.runeaudio.com/forum/openhome-upmpdcli-issues-t522.html#p3281; I believe this has to do with DIDLs not being sent (in the case of BubbleUPnP, which should be OpenHome-aware, via the Playlist service–the Info service seems to work fine).
Conversely, if an album is added to the playlist from a UPnP / DLNA / OpenHome control point, the DIDLs are not passed (or retrieved, if you will) by RuneUI - all that is shown is the track object (in the example shown below, from Asset UPnP):