The Q&A settings page has malformed URLs for the Page Layout images. On this page:
It links to these images:
/wp-content/plugins/qa//ui-admin/images/content-sidebar.png /wp-content/plugins/qa//ui-admin/images/sidebar-content.png /wp-content/plugins/qa//ui-admin/images/content.png
The "//" should be only "/".
The bad code is in "qa/ui-admin/settings-general.php" on lines 24, 29 and 34. This appears to be the only place in the plugin where the "QA_PLUGIN_URL . '/" string appears.