It's a core issue and related with "orientation".
applications/cms/sources/Blocks/Block.php
public static function display( $block, $orientation=NULL )
When you use {block} tag you can't pass orientation variable.
Solution
Open plugins/nb41socialcountfans/widgets/nbSocialCountFans.php
Find and comment
if ($this->orientation != 'vertical')
{
return '';
}
or change to
if (isset($this->orientation) and $this->orientation != 'vertical')
{
return '';
}