I had same issue for a week. I think the issue is program bug at memovie template.
Maybe gavick will fix the problem soon.
On Memovie template, I couldn't open template parameters because there was not memovie template name at template manager.
So, I couldn't disable the option.
I tried to find and modify source file.
Find and open root/templates/gk_memovie/layouts/default.php
Find and remove below source codes
<?php if($this->_tpl->params->get('t3_logo')) : ?>
<a href="http://wiki.joomlart.com/wiki/JA_Template_Framework/Overview" target="_blank" id="t3_logo">Powered by T3 Framework</a>
<?php endif; ?>
<jdoc:include type="modules" name="debug" />