It makes no sense to me. The following is taken directly from what vBulletin.org uses:
Code:
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick" />
<input type="hidden" name="business" value="" />
<input type="hidden" name="page_style" value="PayPal" />
<input type="hidden" name="no_shipping" value="1" />
<input type="hidden" name="no_note" value="1" />
<input type="hidden" name="tax" value="0" />
<input class="button" name="submit" value="Donate Now!" type="submit" />
</form>
Then when you add the $post to the business field, that's where it knows to send it. If it's working for me and not for you guys... maybe it's a modification on your board preventing it? I don't have any modifications other than a couple that only effect the forumhome.
This bothers me and I'm sure I'll continue toying with it for awhile. >_<;