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I see this when researching top pages.   I know for a fact that the pages have title tags that appear to be fine on google and our site, so I'm not sure what the [No Titlle] means or why it's appearing in Open Site Explorer.  Thanks!

Home page redesign advice, please.  We're a growing college textbook publishing company; a unique one in that we publish everything under an open license.  Our homepage www.flatworldknowledge.com has a solid page score (80), and since our product serves several different customers/audiences -- students, faculty, bookstores -- we're transitioning to a dynamic home page approach.  Returning instructors will be served a personalized faculty page, returning students a student oriented page featuring the books they've most recently accessed, and first time/anon visitors will receive a more neutral welcome page until we know more about them. Pros, cons with this change to a dynamic homepage? What should we be thinking about/concerned about from an SEO perspective? How do you address title tags? Will this approach dilute page authority? Thanks all!