JabRef 4.0 Mac Web Search Window closes before results appear

The Web Search worked beautifully for me the first 5 times I used it. Then it stopped. After I reset it, uninstalled JabRef, reinstalled, etc, it is still doing the same thing. I put in the title of an article to search for, and hit Fetch. The search window pops up as expected, but after about a second or so, it closes. The bottom of the main screen reads --> Status: Processing [name of the title I searched for] . This doesn’t change. How can I fix this? I’ve also restarted my computer. Nothing seems to help.

I can not confirm this under Windows, but maybe it comes due to the fact that no results were found?