Yesterday I switched my permalink structure within WordPress, so my links would reflect the title of the entry and not just some cryptic page ID. Everything seemed to work fine and I was absolutely happy - SEO (search engine friendly) URLs, here I come! May Google crawl my site and digest my content.
But this morning, out of curiousity, I clicked on my sub-pages (About, Pictures…) and they only returned a 403 error. To make a 6+ hour trial-and-error-marathon short: changing the permalink structure worked fine for blog entries, but …