I updated my Mac to High Sierra, and upgraded Jabref to 4.0.
I have java version "1.8.0_144"
Java™ SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot™ 64-Bit Server VM (build 25.144-b01, mixed mode)
JabRef freezes if I try to create a new Bibtex entry. Following this github thread https://github.com/JabRef/jabref/issues/2963, I tried to run the current master. The entry editor did open (very slowly), but each step is so slow that it’s almost as bad as if it had frozen.
In the process, I get a warning that says
[AWT-EventQueue-0] WARN org.jabref.logic.l10n.Localization - Warning: could not get message translation for “ID-based_entry_generator” for locale en