I have a little problem with progdvb because I can't find new channel when I scan the satelitte

I use progdvb 4.85.3 with the nexus card (SS1)
I have the signal of transponder, but can't find any channel

If Iput an old channel list, I can watch all channels
ps : with the last progdvb, progdvb crash on start with selected device (the memory can't be read in "0x00000000"), I start progdvb without device card, and after start dezvice card (SS1) and progdvb work
ps2 : I used the last driver for this card (version 2.19)
what can I do for do progdvb work correctly

thanks for all