Q and A layout in Catalyst theme framework

Have installed Q&A which works fine using default (twentyten) theme. However, on installing the theme I want to use – a child theme of the Catalyst framework the questions all appear but with no other page elements (no header, sidebars etc).

Not sure if it is helpful but the single.php file in Catalyst contains nothing other than: <? php catalyst_framework ();

I will also ask on the Catalyst forum but any suggestions here would be welcome.