When I align to the right I see the following:
<TD id="dnn_ctr470_ContentPane" align="center" class="DNNAlignright">
When I leave it as Default I get the following:
<TD id="dnn_ctr470_ContentPane" align="center" class="DNNAligndefault">
The problem is (I think) that DNNAlignright exists in Portals\_default\default.css and DNNAligndefault does not exist