Recalling again, after many trials:
I have been running two legal cards with CI Cams (not+), Swedish Boxer on terrestrial, Swedish Canal Digital on satellite.
On VU+ Ultimo and Dreamboxes (and other hardware) that has worked for over ten years without problems.
I bought a VU+ Duo4kSE ty replace my VU+ Ultimo. Swedish Boxer (T2), works fine with CI Cam (not+) as before.
Swedish Canal Digital works fine on S channels, but on S2 channels I get distorted sound and picture, but enough to recognize the channels.
I previously thought that this had something to do with the release, that older releases (older enigma/python) worked, but not new ones.
After trying various software, OpenPLI, OpenVix, OpenBh, OpenDroid, PurE2, Egami, I find that:
All releases work on S channels, but not S2 - if bitrate set to normal in CAM menu. High bitrate seems to be default, that is why I did not discover this before.
So, my problem has nothing to do with changes in releases. It seems to be in the Duo4kSE. What?