On closer look, the plugin inserts a line like the following after the postTabs content has been added to the page, with the aim of hiding/revealing the appropriate tab content:
<script type=’text/javascript’>jQuery(document).ready(function() { postTabs_show(1,445); });</script><script type=”text/javascript”>
This is supposed to override the jQuery(document).ready(function() {*contents here*}); defined in the postTabs.js file. For some reason, this is no longer working in WP 3.5. The base defined jQuery(document).ready(function() {*contents here*}); is called instead which means the basic page view (1st tab?) is loaded rather than the specific tab that the user clicked on.
Any js buffs out there able to help with a diagnostic?