SQL Problems

[Wayne Luke]

Try:

SELECT thread.*, post.* FROM thread
    LEFT JOIN post ON (threadid)
  WHERE thread.threadid=post.threadid
    AND forumid=$newsforums
    AND post.dateline > $replycountexpire
  GROUP BY thread.threadid";
  ORDER BY threadid.replycount DESC LIMIT 0,$newsitems";

You had "AND threadid=$newsforums" which most likely resulted in no matches within the time specified.