You have to strip away some of the stuff in the instructions for quickreply.tmpl
This is in the instructions:
####FIND <br />{$ubbt_lang['DO_PREVIEW']} <br />###ADD BELOW IT <br /><br /><br /> <br /><tr><td class = "buttons"><a href="javascript:void(0)" onclick="openGraemlinPanel()"><table class = "darktable">{$ubbt_lang['MORE_G']}</a></td></tr></table> <br /><a name="quickreply"></a>
Instead, change it to:
<br />####FIND <br />{$ubbt_lang['DO_PREVIEW']} <br />###ADD BELOW IT <br /><br /><br /> <br /><a href="javascript:void(0)" onclick="openGraemlinPanel()">{$ubbt_lang['MORE_G']}</a> <br /><a name="quickreply"></a>
My lines 27-38 look like so:
<td class="darktable" width="17%" valign="top"> <br /><form method="post" action="{$config['phpurl']}/addpost.php" name="replier"> <br /><b>{$ubbt_lang['OPTIONS']}:</b><br /><br /> <br />$addsig <br />$markupselect <br /><br /><br /> <br /><input type="checkbox" name="preview" value="1" $Pselected class="formboxes" /> <br />{$ubbt_lang['DO_PREVIEW']} <br /><br /><br /><br /> <br /><a href="javascript:void(0)" onclick="openGraemlinPanel()">{$ubbt_lang['MORE_G']}</a> <br /><a name="quickreply"></a> <br /></td>
Hope that helps. That way it gets rid of some extra tables you dont need which is why people get the 'purple boxes' in their quickreply template.