Problems with Page Builder version 2.5.2 with the Sydney Theme.

I use the Page Builder(older version) to make my website with Sydney Theme.Now when i have updated neither the widgets neither the Sydney tools are working and i am stuck to a website structure where i cannot progress.I have an option to roll back,but i got to know that website sometimes can crash by doing that.I am very confused,how i further proceed.I will be very thankful for your advice.