That's why I asked if he uses any autosettings plugin: because they often cause troubles...I make my lists, no plugins from anyone ...
Is everything well configured for tuners, namely DiSEqC / doors?
Yes, my bet... I have Quadro LNB and I tested only the LNB from another room...You said the cable was tested with another receiver and that it was ok... (#3)... thankfully it was resolved