I was having some trouble getting my Humax Freesat receiver (the FOXSAT-HD model) recording two channels at the same time. The reason I was having trouble is due to the fact that when I initially used the device I had only connected it with a single digital input. I later connected both inputs (when I had extra cabling installed). The Humax box detected that both tuners were connected but I could not view all channels when I was recording.
To fix it I had to do a factory reset. Fortunately, when you do this it doesn’t wipe all your recorded stuff (think it wiped my record schedule though but not sure if it’s my bad memory). When the box restarts it takes you through the initial set up and should detect both satellite inputs and tunes them in. I can now record and watch TV at the same time.
I’d still highly recommend the Humax Freesat receiver to anyone looking for such a device. I had the Freeview receiver before I upgraded to Freesat and that was pretty good too!
Hope this helps someone else!