I am encountering the same issue as Rolf did a few month ago, i.e. I have installed and used Jabref on Windows 7 and suddenly, it does not open any more (it seems to load after having double-clicked on it, but nothing happens). To solve this issue, I have tried to run the command that Rolf has suggested (java -jar JabRef-3.8.2.jar --prdef all -n), but it has not worked out for me... Does anyone encounter the same problem and would suggest another solution?
Many thanks in advance for your help!