@wizzard thanks!

Hi, Im sorry to complain, but I was on 7.2.2 (with problems to get my hifiberry digi+ working) and today I was offered to update to 8.
Result: no roms are working anymore, my sound still doesn't work and my screen has the wrong aspect ratio. (it is 16:9 but my LCD monitor is 4:3).
I don't know what to do now.
AFAIK there is no way to downgrade to 7.2.2 again, right?
Please help me.