I have problems with the image contrast or the black doesn't reach higher densities and the scenes are washed out? I went back to version 10 and magically everything was resolved? What happened to, will I ever be able to upgrade to version 11 or am I limited by my hardware?
Looks like Full RGB mode is not active for your screen device output. I had the same problem which was solved by adding
to /storage/.config/autostart.sh (https://wiki.libreelec.tv/configuration/…wn#autostart.sh). Replace 239 with connector (video output) number specific to your system, which can be discovered by inspecting modetest text dump when ran without arguments.
Also make sure that your Settings / System / Display / Use limited color range option is not enabled.