Indeed I am.
I messed around a litle ith the form and now it runs OK, however I can not add the CSS file to scene builder, or I get an error during runtime, saying that stylesheet is not present or is read-only !!! (and of course it's present, it's not read-only and apears ok in scenebuilder)
So I solve part of the problem, and got a new one, as the CSS was working ok, previously with JDK8. But I'm not that worried with this one. Things do not look as I wanted to, but at least it works.