I just got a 2 Hopper, 3 Joey system installed this past Saturday. The two Joeys that are linked to Hopper A are able to view/access recordings from either Hopper. The Joey hooked up to Hopper B can only play recordings on Hopper B. When I try to use this Joey to view recordings from Hopper A, I select Play and then get a plain, black screen. Any ideas on what to do to correct this?