I get this error sometimes when viewing the list of the widget:
Warning: Invalid argument supplied for foreach() in /home/board/public_html/wp-includes/query.php on line 2746
I hope you can fix this. I'm using 3.3 of wordpress and having been testing out some plugins on my blog to see if they work or not.
http://wordpress.org/extend/plugins/folding-category-widget/
