@ImADev; I’ve restored all Android (raw and ext) partitions and all went well so the Macrium backup is ok 🙂
Without anything installed or modifications … same bug! It seems to occur when the notifications slider is set to 0% 🙁
Anyway, now I can reinstall your Chuwitweaks, setup 3 users, deinstall it and install your modified kernel (looked better be the way). Now I will try it with Su enabled ;-). Is there a way to see its your kernal (besides better looking screen)? I did’t notice anything different in the Android info screen. Dpi was also the same. Is it some kind of screenfilter or other font(s)?
Thanks again ImADev, for all your help.