I'm trying to change the security model from :   "Login user may do all" to: Matrix-based  security(Jenkins-1)

But I can't save the changes, the Save and the Cancel buttons don't react!

Please notice that the rending of the page looks a bit "wrong" (jenkins-2.png) and Chrome indicates errors (Chrome-browse-error-.log) while loading loading it,  I cannot see any errors in jenkins.error.log

Regards Hans