Hi jordi-d
As we explained here: https://www.joomlart.com/forums/d/37741-we-are-sorry-ja-page-builder-server-is-under-update
For now, you can edit content for old pages (created before 8th October) by HTML editor or via database, we provided in details how to change there.
Due to many requests received to re-create pages, it's hard to re-create all pages for now.
If you have pages need to be edited urgently, please list them here so we can re-create for you.