JabRef_windows-x64_4_0_0-dev--snapshot--2017-02-05--multicleanup--ddecdfd3f
Windows 7
java 1.8.0_121

Steps to reproduce:

1. open a new database
2. input from medline PMID 27151464
3. run cleanup
4. try save or save as

this does not give any reaction; the program when run exit notices there is something to save but the file dialog does not open.

Put the excerpt of the log file here

btw: where to find the log file?