[kh99]

The condition you have in #1 will show one after the first post on each page, while I think the condition in #2 will only show one after post#1. So you only need one of those and I'm going with #1. So try this (I've just put one inside the other):

<if condition="(($post[postcount] % $vboptions[maxposts] == 1))">
<if condition="($thread['forumid'] != '56') AND ($thread['forumid'] != '27') AND ($thread['forumid'] != '11')">
       <div class="postbit_adcode">
<span style="float: right; width: 340px; height: 285px;">
			Your Code Goes Here
</span>
</div>
</if>
</if>