A month ago i upgraded to 3.1 and lost my month/post permalinks. I get only 404 messages when clicking on a specific article. I posted this issue elsewhere and someone suggested that it was my apache mod rewrite file on the server.. I called my host and they said nothing had been changed. I upgraded today to 3.1.1 hoping that it would be fixed with the upgrade but it still only works with the default setting.. I've lost over 1,000 percent of my traffic in the last month which was a shock.. and i'd surely like to resolve this issue but I need help. thanks in advance!