problem with saving widgets

Hello,
I’m having problem with saving widgets, it seems as though it just not willing to ‘save’ the changes that I make. Iv’e stumbled upon a thread from over a year ago that suggests it might be a problem with the Page Builder plugin.
Do you have any suggestion as to what to do?

This is my website:
http://cpanel10.tempdomain.co.il/~merkazshefer/