No video or audio on some satellites

#1
Hello!
I was finally able to run progDVB with diseqc support for avermedia a700 card, but i encountered another problem.
In the version 4.85.3 i'm able to scan 4 LNB's. Scan finds all channels and shows good signal as well. But when the scan is done i'm only able to view channels from 2 LNB's...The other two gives me no signal(but on scan they had one), no audio or video...Sometimes those LNB's on channel switch give me an image which freezes(the video itself not the program) immediately.
Every newer version 4.x or 5.x doesn't have this problem and works fine. Yet i need to use the 4.85.3 version of the progDVB coz that's the only version that is supported by dvbsbridge application which i'm using to stream signal from progdvb to mce...
What is the possible cause of the problem?