Slider in Sydney Theme missing after latest updates

Hi, I have had some incompatibility issues between the new Sydney Toolbox and Elementor. Had to deactivate Sydney Toolbox to get rid of the critical error that crashed the site. It worked until recently when I installed all suggested updates to the theme, toolbox, and elementor. The website is now missing the front page slider that is part of the standard front page of the Sydney theme. The content (pictures and texts) for the slider are still shown under Theme Appearance > Customize, but they are not shown on the page.

Have been having problems for weeks now and wonder if I shall choose a different theme, or get rid of Elementor.
Thanks!
PS: @romanbon created a new thread as requested.