Widget Logic locks admin widget access with WP 3.5

After updating to WP 3.5, Widget Logic appears to have ‘frozen’ access to Widgets from the Appearance > Widgets page, as others have noted here: http://wordpress.org/support/topic/plugin-widgets-logic-visual-widgets-no-longer-expand-after-wp-35-upgrade?replies=14
… Even though a workaround code fix is posted on the page above (which probably is fine), I think I’ll wait until the developer releases a tested update to try again.

http://wordpress.org/extend/plugins/widget-logic/