404’s on post permalinks could be due to a number of different issues, but for me it was caused by a plugin gone bad during a WordPress update: Top Level Categories was broken by WordPress 3.1, and replacing it with FV Top Level Categories was the fix.
Like this post? Tip me with bitcoin!
If you enjoyed reading this post, please consider tipping me using Bitcoin. Each post gets its own unique Bitcoin address so by tipping you're not only making my continued efforts possible but telling me what you liked.