I'm using Version 1.2.2: (03.26.2010 of Newscast and was successfully using the great feature in your theme which allows to control sidebar in individual pages and categories until recently. I upgraded to WP 3.1.1. and all my page and category specific sidebars have disappeared. When I look at the Appearance/Widget page where I configure widgets (/wp-admin/widgets.php), only the general ones are there along the right hand side. There are a pile of Inactive widgets that been previously associated with various pages and categories.
The page where I can configured which pages and categories should have sidebars (/wp-admin/options.php?page=sidebar_footer.php) looks fine: http://screencast.com/t/QbG5gSiF9Spx .... same as before). I even tried adding and deleting from this list to no avail.
I would be ok to update the theme but since I changed some of the CSS, I have to be careful not to erase/overwrite those files. I've been battling with this problem for many weeks and need your help. I can provide you access as necessary.