Here are your answers :)
1) Business slider and magazine slider not working: This is a bug with canvas. Try going to dynamic images and clicking save. This normally fixes things
2) Portfolio has been removed in the latest version of canvas . You can use the woothemes projects plugin instead https://wordpress.org/plugins/projects-by-woothemes/. It’s not quite as nice but it should work
3) Testimonials have been removed as well. But here is a replacement plugin https://wordpress.org/plugins/testimonials-by-woothemes/
4) PageBuilder – I’m not quite clear on this – is there a link you could share?