I've been using JWrapper for about a year now with no problems.
Now, on one user's machine with Mac OS X El Capitan, almost everytime I release a new version of my software the JWrapper splash screen on first launch never goes away until the system is rebooted.
I've had look at the logs and see nothing suspicious and I see that my application seems to launch correctly.
Suggestions welcome, this is not a proper SO question I know but JWrapper people tell that they are experimenting with support for the Free version on SO, thus I'm basically trying to get them to answer this.