I can see that this happened a year ago, but not since.
I have a brand new blog so I wanted to try out WordPress SEO instead of All in One SEO.
I have a static first page with image. One of the pages is my blog, and will have regular posts in there.
The pages have normal titles: Page - Name of site. However, the CHILD pages have only Page Name, no Name of Site, and the same for every single post: post name - no blog name. It seems, then, to be a child problem, since some categories are child, and in my own mind, at least, posts on the Blog Page are like children, too.
I can't wait any longer, after reading his pages of instruction, queries here, etc. I never had a problem like this with the All in One Seo plugin. I did change the header as suggested a year ago to: <title><?php wp_title(''); ?></title> , but no diff.
Would welcome any suggestion at all. Meanwhile, back to the other plugin!