How to use ReadyNAS (UPNP Server)?

Since updating to the lastest aTV my ReadyNAS UPNP shares (all my movies) are gone. It used to just work but now I can’t even figure out where in the menus to look…

UPnP streaming was not included in the 3.2.x versions. It will be included again in the next (3.3) release.

well at least that explains why I can’t FIND it… should I downgrade?