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"Im 100% positive that its a php function recursivilly calling httpd spawns. I've programed in PHP/MySQL for over 4 years now. [/]
There are only 2 spots that do recursive function calls postlist.php and showthreaded.php, but that is only to do post threading, they definitely don't create any new httpd processes. That would need to be done with a recursive call that maybe called a header("Location: ..."); or something of that nature which definitely isn't anything that .threads does.
I did a quick search on deja and found alot of posts from users having these problems on specific OS's and php.