I’ve experienced several issues with JabRef 4.31for Mac so I decided to give it a try to JabRef 5 (btw, amazing work everyone!). Whereas ver. 5 solved some issues from 4.31, it came with others. Most prominently is that there is no entry preview, but there are other issues like the installation sometimes freezes. Since JabRef is such a great product, I refused to give it up and then I tried to run the Jar file directly. It worked perfectly. In fact, all the problems seem to be gone. I can make (and maintain) groups, it actually quits (I don’t have to kill the process), among other issues. Perhaps this can be solved relatively easily, but for the time being, I am more than happy with running the Jar file. Perhaps somebody else experienced the same problem/solution.