[Critical] What did I do wrong?

[Kirk Y]

You're supposed to replace this:

<if condition="$show['gotonewpost']">
				<strong><a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a></strong>
			<else />
				<a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]">$thread[threadtitle]</a>
			</if>

With this:

<!-- vbPlaza start -->
			<if condition="$show['gotonewpost']">
				<strong><a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]" <if condition="$thread['titlestyle']">style="$thread[titlestyle]"</if>>$thread[threadtitle]</a></strong>
			<else />
				<a href="showthread.php?$session[sessionurl]t=$thread[threadid]$thread[highlight]" id="thread_title_$thread[realthreadid]" <if condition="$thread['titlestyle']">style="$thread[titlestyle]"</if>>$thread[threadtitle]</a>
			</if>
<!-- vbPlaza end -->

Only you didn't find the right piece of code to be replaced -- you replaced the code above that in the threadbit template:

<if condition="$show['gotonewpost']"><a href="showthread.php?$session[sessionurl]goto=newpost&amp;t=$thread[threadid]"><img class="inlineimg" src="$stylevar[imgdir_button]/firstnew.gif" alt="$vbphrase[go_to_first_new_post]" border="0" /></a></if>

Suffice it to say, just redo the template edits for your threadbit template and look carefully at what you're supposed to find.