I have recently spotted that after upgrading to the latest All in One SEO plugin version on various clients' domains, that the SEO Doctor Browser plugin flags the webpage as not indexable.
"The page is not indexable, because this page has as a canonical URL set to *domain*" is the error message.
When the canonical option is turned off in All in One SEO, the error is not thrown anymore. However, this used to work before.
May this be a bug as I practically see this issue with various themes and the problem is always there.
Many thanks for your advise.