Yes, I selected the Blog template under select template to edit. The saving issues seem to be specific to the Design, Layout and Grid Loop tabs. The status indicator displays that the theme settings have updated successfully. However, no changes are implemented when viewing the page.
Other options like General, Typography, Sidebars, Logo are saving after making test changes.
Within the page editor, I can select between boxed and full screen using the page design meta box on the page editor and save changes. However, I cannot toggle off the use default layout for page under custom layout option at the bottom of the post.
Thoughts on how best to proceed?