Log into my wordpress and was greeted with a new version to download.  Dumbly upgraded my wordpress and suddenly, I could not access any of my single post.  index page was still fine, but individual post could not be open.  It keep giving “page not found” error.  I found out from wordpress forum that permalinks with index.php in it are broken with this revision and will only be fix in the next revision.  During that short duration that the blog was out, I lost valuable viewerships.  The simple fix is to remove index.php out from the permalink structure, or in the cagegory or base tags, put something in there, anything is fine.  Howcome no one caught this gross bug?