Hello everyone!
I have tested this on a new computer and it worked fine, but I have a theory. Oracle has been lagging behind on updating some certificates for JavaFX (we are pushing them to update this).
What you need to make sure is that when you first start loadUI, you click
Run in the dialogs that looks similar to this:

- digital_signature.png (6.65 KiB) Viewed 5650 times
There will be two of these dialogs, and they sometimes lose focus quick so you cannot see them without minimizing loadUI.
Let me know if this makes any difference.
Henrik
SmartBear Software
PS. If it doesn't work, also try to execute "javaws -uninstall" from the cmd prompt.