My antenna configuration is twin LNB on 28.2, one feed direct to tuner 2, the other through a disecq switch (port B) to tuner 1, with a single LNB on 19.2 into port A of the disecq switch. Manual tuning has been done, all freesat channels seem to be there, and most 19.2 channels. With Diablo2 CAM and TNTSAT card, all tuned TNTSAT SD channels clear OK. But.. some transponders on 19.2 show no signal, and a scan on those transponders finds no channels. e.g. 12522V. Other transponders of the same band and polarisation are OK. I know that the LNB and cabling is OK, because a Strong TNTSAT box decodes channels on that transponder, even with the Strong getting its signal from tuner 1 out of the hummy, but the hummy simultaneously shows 0 strength and 0 quality on the same transponder. Now I know that I could reconfigure my LNBs to a simpler configuration, do another factory reset etc, but is it likely to help? Is this likely to be an artifact of having different satellite configs on each tuner?