Hello @ORV !

Looks like a little glitch. Try to use this code for the init method in the BxTimelineGridMute file:

public function init($bForceInit = false)
  {
    if(!parent::init($bForceInit))
      return false;
    $aSQLParts = $this->_oConnection->getConnectedContentAsSQLParts('p', 'id', $this->_oProfile->id());
    $this->addMarkers(array(
      'join_connections' => $aSQLParts['join']
    ));
    return true;
  }