thank you for the reply.
trying to build a page from scratch using page builder i came to realize the conflict with sydney widgets. everything was running smoothly until i added a sydney widget: the moment i hit the update button, ewerything got lost - the page editor switched by itself to text mode, losing the page builder editing structure. trying to revert to page builder, put me in front of a single row with a visual editor widget inside - everything lost! i “tested” this with 2 sydney widgets: services type a and employees, but my guess is this issue happens with every sydney widget.
i am running php 5.3 on my website.
hope we’ll sort it out… until then, i will remake the front page, saving a backup without adding sydney widgets, then add the sydney widgets, hit update, losing page builder editing capability but having a functional page-builder-non-editable page up and running and hoping this improvised remedy will not last long…