Using SZ or ZW won't switch the panel into the "secure layer", but just show the command was executed, this can be really confusing, making you think it didn't work, even though it does.
(I heard Koluszki has the same problem)
As part of the CodeWeavers team, I'd suggest opening a ticket on our website, so it will end up in our bug tracker: https://www.codeweavers.com/contact-us#support
The text "Wejście w tryb PEŁEN NADZÓR" is the same in every language in the ETCS DMI, however it should be "Entry in FS" in English or "Aufnahme in FS" in German. Likewise for other languages.
We have some "bUT ThiS is A gERman SErvER" people as well, but in general talking/writing in English is accepted. Just keep in mind that Events (closing tracks, etc. aren't allowed at all)
Changed a little bit about the rendering. Everything should look a little sharper now. If you find any issues let me know.
Edit: Okay, this still has issues on higher resolution monitors and on phones. 😐