Compatibility Polylang

I can confirm this issue.

Change

if ( ( $instance['dw_include'] && false == $show ) || ( 0 == $instance['dw_include'] && $show ) ) {
    return false;
} else if ( defined('ICL_LANGUAGE_CODE') && $instance['dw_include'] && $show && ! isset( $instance[ 'lang-' . ICL_LANGUAGE_CODE ] ) ) {
    //if the widget has to be visible here, but the current language has not been checked, return false
    return false;
}

to this

if ( ( $instance['dw_include'] && false == $show ) || ( 0 == $instance['dw_include'] && $show ) ) {
	return false;
} else if ( defined('ICL_LANGUAGE_CODE') && $instance['dw_include'] && $show && ! isset( $instance[ 'lang-' . ICL_LANGUAGE_CODE ] ) ) {
	//if the widget has to be visible here, but the current language has not been checked, return false
	//return false;
}