JabRef 5.0-dev--snapshot--2018-11-29--master--37be33450
Linux 4.9.0-8-amd64 amd64
Java 1.8.0_181

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

Steps to reproduce the behavior:

1. Quality
2. find unlinked files
3. scan directory
4. import
   Then the window will disappear and the files are not imported.

Paste an excerpt of your log file here