[Grendel]

I think some brackets are missing (the IF is not closed). SQL-Error, if I try it like you wrote. If I add some brackets:

$forumposts = $DB_site->query_first("SELECT SUM(IF(thread.forumid IN (1, 2, 4, 6, 10), 1, 0)) as first, SUM(IF(thread.forumid IN (3, 5, 7, 8, 9), 1, 0)) as second FROM post LEFT JOIN thread USING(threadid)");

(no sql error) the count is wrong:

2973 (48935/44152)

First number is the whole count, second the $forumposts[first], last the $forumposts[second]

Any guesses?