I’ve currently disabled page navigation on this site as it appears to be broken. While I can’t be 100% certain, the culprit appears to be the Jetpack plugin I use that incorporates WordPress.com Stats.
This site uses custom permalinks, /%category%/%postname%/, but when navigating pages the URLs are incorrect. Instead of http://domain/page/2 they’re being re-written as http://domain/2. Consequently, I’m getting 404 Not Found errors.
Why blame the Jetpack plugin? By accident, I deactivated the Jetpack plugin and noticed that page navigation was working. Interestingly, the issue arises only if I’m not logged-in as admin.
I’ve posted more detail over on the WordPress.com forums in the hope someone has an answer.
Until I’ve managed to fix this, all of my posts, a laughable 30 in total, will appear on one long page.