Are you able to check the reception data for each multiplex, or to try tuning any one manually? Your problem, I assume, is with Mulitplex PSB1/BBCA, which uses channel 23, 490.0 MHz, with all the others getting detected ok. http://www.ukfree.tv/txdetail.php?a=TQ339712 Can others using the communal aerial pick it up? The only post-switchover problem I've come across that affects only one multiplex is the slight frequency change of multiplex COM6, to 529.8MHz. Some freeview boxes, including an old Goodman of mine, can't cope with its no longer being an exact 8 MHz step from the surrounding channels But that's not the case with PSB1. PS. I've just remembered experiencing the same problem with a Medion freeview box.. I eventually found that it had successfully detected the signal, but rather than assigning the stations local numbers 1, 2, etc for selection, matching their EPG entry, had placed them much higher in the range, possibly the 300s or the 800s. So do have a flip all the way through your stored channels in case they're hidden away somewhere. If so, it may be possible to move them to their usual locations.