We have a pages block in 4.3.6 with the following custom html code
<div class="ipsLayout_right" class="ccsBase ccsBlock">
<h2>Forum Sponsors</h2>
<table class='Forum Sponsors'>
<tr><td align='center'>HEADING HERE</td></tr>
<tr><td align='center'><a href="URL HERE" target="_blank" title="Click here to view ADVERT"> <img src="IMAGE URL HERE" ></a></td></tr>
</table>
This works fine in 4.3 - yet when we do a trial upgrade to 4.6.x the formatting is wrong (centre)
We did ask Invision, but outside their support so all help appreciated