I upgraded to 3.1 from 3.05 today, and I encountered problem after the update. Custom permalinks with %category% did not work properly, they returned 404 errors on all my articles. Simple removing the %category% solved this error, however I’d much prefer keeping it.

I found information from wordpress forum, but much solutions couldnot solve my problem. Actually, there are several people who have reported similar issues and are seeing 500 errors on permalinks and redirects.

Finally, Google was answered. I found the trick. It can solve my worpress problem. Here’s the solution: (lagi…)