Through process of elimination, I discovered that WordPress SEO breaks post pagination on my WordPress installation.
I.e. Post pagination using the <!--nextpage--> shortcode inside posts.
This is my permalink structure:
/%year%/%monthnum%-%post_id%-%postname%.html
I thought the problem could be my permalink structure but I've discovered that post pagination is still broken if the default "ugly" permalink structure is used.
I.e. ?p=1234&page=2
Disabling WordPress SEO restores post pagination functionality.
I turned off the "Enforce trailing slash" option under the WordPress SEO Permalinks configuration section but still no luck getting it to work.
I really do like WordPress SEO and would hate to be forced to uninstall it. If anyone could shed any light on how I might be able to fix this, it would be greatly appreciated.
Thanks!