[trekk]

Originally Posted by NiLuJe

@trekk: Are you by any chance installing any patches at the same time?

I did:

overrides:
  src/nickel.yaml:
    Increase home screen cover size: yes
    Reduce new header/footer height: yes
    Custom new header/footer font: no
    Remove footer (row3) on new home screen: yes
  src/libadobe.so.yaml:
    Keep PDF pan position: yes
  src/libnickel.so.1.0.0.yaml:
    Set KePub hyphenation: yes
    Rename new home screen footer: yes
    Always show confirmation dialog before upgrading: yes
    Remove beta features not supported text: yes
    Disable all tutorial dialogs: yes
    Never show Kobo Plus, wishlist, and points SmartLinks: yes
    Remove recommendations (row1col2) from home screen: yes
    Don't uppercase header/footer text: yes
    Remove title from reading header/footer: no
    My 10 line spacing values: yes
    Freedom to advanced fonts control: yes
    Force user line spacing in KePubs: yes
    Shorten dictionary entry not found message: yes
  src/librmsdk.so.1.0.0.yaml:
    Disable orphans/widows avoidance: yes

Originally Posted by NiLuJe

Because KOReader/Plato have zero interaction with Nickel, and KFMon only does so as a byproduct of lower level system stuff, none of them UI/graphics related.

So, it technically doesn't make any sense.

I totally agree.

Originally Posted by NiLuJe

That said, does it happen on a fresh boot, or only after exiting KOReader/Plato?
Does it happen in other orientations?
Do you have anything funky enabled in your Kobo config file?

It happens in any orientation. In my Kobo config file I added:

[FeatureSettings]
ExcludeSyncFolders=\\.(?!kobo|adobe).*?
FullBookPageNumbers=false

Originally Posted by NiLuJe

EDIT: I'd ask you if it happens with other locales, but since I can't reproduce it either after switching my H2O to German, I somehow doubt that.

Other locales seem to be OK. I will try another factory reset then. Thank you very much for your help so far! Much appreciated