Jabref was broken and reinstalled it - now it does not show text

Hey everyone,

I freshly installed JabRef 4.3.1 and it shows me this information for my bibliography:

grafik

All entries are still there, I can browse separately through them, but it does not show text in the main window. What can I do about it? What info would help you to help me? I am running this on Windows 10 1909.

Thanks a lot!