I have been using three devices, namely: Sky Star 2 PCI and USB, KWorld DVB-S100 (PCI), and AVerMedia A707 AVerTV Satellite Trinity Card PCI-Express with ProgDVB. Both KWorld and AVerMedia A707 are BDA compatible. The question is what makes ProgDVB finds all transponders/channels with Sky Star 2 and not find all with the other two? Another intermittent problem observed with ProgDVB which is common with all the three cards is that when you tune to a channel there is no picture and no sound although both signal level and quality are high.

Try manual scanner and check File->Input traffic->Packet lost. Signal level is only number and not important.

Then what is to be done?

very nice post

I need more information. Try rescan channels at first and remove losted channels in scanner report.
and try manual scanner if some transponders not scanned.

OK. I did a comparison experiment between two cards the details in the attachment.