Seems problem solved for now. I tried a some different convertors and i found one working with progdvb and my skystar tuner. It is "MTI AP8-XTS2E-FS". Not sure why other converter worked wrong sometimes, but I found one working
Sometimes (very often) ProgDVB can't lock transponder (Level: 90% Quality: 0%) when i swith channels. ( tested on hotbird 13e: 11034, 10719, 11317). And in this time many other tranponders work fine. I can switch channels there and quality 60-80%