JabRef 5.0-dev--snapshot--2019-02-19--master--1b6c7b5b9
Windows 7 6.1 amd64
Java 1.8.0_201

• [+] I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

Steps to reproduce the behavior:

1. When dragging a item into a group the item count does not increase. Only be opening the group one sees that the entry has been dragged at all, while the item count remains zero in the example
2. ...
3. ...
   

Removing selected items from a group using right click on the group and use "remove selected entries from this group" is not working at all. I had to remove entries with right clicking the entry and using the "remove from group" dialog separately on each entry.