[Admin]

Try to replace this in functions.php:

  	  $comma1 = ',';
    } else {
      eval("\$day2 .= \"$comma2 ".gettemplate('calendar_showbirthdays',1,0)."\";");
      $comma2 = ',';

with this:

  	  $comma1 = '<br>';
    } else {
      eval("\$day2 .= \"$comma2 ".gettemplate('calendar_showbirthdays',1,0)."\";");
      $comma2 = '<br>';

After you do this make sure you go to your user profile, and click update.