JabRef 4.0.0-dev--snapshot--2017-07-11--master--e35b6ac2c Mac OS X 10.11.6 x86_64 Java 1.8.0_131 The bugs: 1. The autocompletion does not work in the author and journal fields. 2. The autocompletion dropdown box gives many same items. When you search something once more, there are two dropdown boxes overlap there.  
JabRef 4.0.0-dev--snapshot--2017-07-11--master--e35b6ac2c
Mac OS X 10.11.6 x86_64
Java 1.8.0_131
The bugs:
The autocompletion does not work in the author and journal fields.
The autocompletion dropdown box gives many same items. When you search something once more, there are two dropdown boxes overlap there.