WordPress to version 5 not works with Avia Page Builder

At the weekend I did updates from WordPress to version 5. Now the Avia Page Builder is not working properly anymore. The Function element icons can’t be moved down.

If you want to drag a fuction icon over the end of the displayed screen, the screen will move up, but the screen will remain white and will not show anything.

The same happens when I click on a function elements. Then the Function will be placed at the end of the work screen, but if I want to move it up, also only a white screen will appear again.

I have already installed an update to Enfold version 4.51. That’s not the fault.

Now I reinstalled WordPress back to version 4.9.8 and the Avia Page Builder works fine.