I’ve had the first one (Plus) for over a year and i haven’t had any trouble getting to my HDD shared on my network (shared by airport extreme). But when i try to connect with the new WD TV Live it doesn’t find any shared drive on the network.
Your network workgroup setting must match the one that your network share is in. So if your NAS or PC does not belong to the default workgroup WORKGROUP than you need to change the setting in the SMP.