Given that I have two CI+ cams 4K and two cards 4K (FRANSAT and TIVUSAT-black-) when I installed DE 7.1, I deactivated CI+ Manager to go to the screen to activate the HIGHT BITRATE option. Well, as soon as I try to enter that screen (menu/configurations/peripherals/common interface) I get the green screen and the decoder restarts. I tried a second time and it was green again.
With DE 6.0 this didn't happen and I was able to access the above screen.
Of course if I can't activate HIGHT BITRATE my 2 cards can't work.