JabRef version 4-beta2 on Ubuntu 16.04 with open JDK 1.8.0_131 (happens also under Windows 7)
Steps to reproduce:
Issue A:
- Drag new entry into a group
- Jabref freezes - need to kill process to continue
Workaround: Assign a new entry to a group by using right-click context menu -> add to group
This will add an article to the assigned group.
Issue B:
- Drag an entry in the groups menu into a different position
- Jabref freezes - need to kill process to continue
Workaround: None found yet.