It works fine.
There must be a different issue on your site.
Not sure if this helps …
I ran into an issue when I tried to hide widgets in individual posts that belong to specified categories (i.e. categories I choose in the widget admin). I fixed it by adding this code to the plugin’s main restrict-widgets.php file, at line 1477:
} elseif (is_single() ) {
$valid_option = false;
foreach (get_the_category() as $c) {
if (isset( $options['category_' . $c->term_id] )) {
$valid_option = true;
break;
}
}
}
PS Watch the braces {} to ensure the if..elseif…else statement is properly closed out.
