Hi,
first of all thanks for the reply! I reset the preferences, and nothing changed. I did expect that, because, as mentioned, it was a freshly downloaded jabref, and I tried this before…
the language is set to ENGLISH, and the encoding is UTF-8. I confirmed this by typing “ENGLISH” and “UTF-8” into the search bar and compare the resulting gibberish to the gibberish in the settings, where the language and the encoding is set.
I narrowed this down to a user-problem: the exact same JabRef (i copied the folder to a shared drive) works on a second user on the same pc! So I controlled env-Variables, java-settings, and everything, but I cant find the difference, that leads to this error. This is why I think, there must be something saved for the user, thats somehow broken…