I'm working on a D6 to D7 upgrade and am looking at using blacksea for the my theme. I'm using Media Gallery to replace by D6 Acidfree albums. I've configured the /galleries page to display 4 columns but with blacksea I was only getting one giant column. Bartik displayed them correctly and noticed that blacksea was missing several classes in the node div. Bartik adds "$classes" to the its node. I modified Blacksea's node.tpl.php to do the same thing:

<div class="node-<?php print $node->nid;?> <?php print $classes; ?> node<?php if ($sticky) { print ' sticky'; } ?><?php if (!$status) { print ' node-unpublished'; } ?> clearfix thing"><div class="node-inner">