Plugin not tracking

My client uses this “ExitSplash” plugin that’s supposed to track when people initiate an exit popup. Anyways, on his server, it’s not tracking, while on my server, it works fine. I moved the database and all the files are 100% identical. Any reason why it wouldn’t work? Here’s the plugin’s file that generates a 1px image which is used for tracking. I’ve tried everything and it all points to some server setting being off on his host. Any suggestions would be GREATLY GREATLY appreciated as I’ve gone half-crazy trying to figure out this plugin.

<?php
/*
ExitSplash Plugin stats tracking
*/
$type = $_GET['t'];
$pid = $_GET['pid'];
if (isset($pid)){	

	require_once("../../../wp-config.php");
	global $wpdb;

	//this records an exit initiation and stores it in the corresponding exit record in the database
	if ($type == 'init'){	

		$sql = "UPDATE ".$wpdb->prefix."exit_splash SET close_window_exitinits=close_window_exitinits+1 WHERE id='".$pid."'";
		$wpdb->query($sql);

		//set a cookie for this given initiation used for tracking
		setcookie("exitsplash_tracking".$pid, $pid, time()+60*60*24*100, "/");

	}else if ($type == 'action'){

		//only record this action if cookie exists, to avoid duplicate actions
		if ($_COOKIE['exitsplash_tracking'.$pid]){		

			//this records an action from the action tracking link for the given exit page record in the database
			//need to determine if this is an internal page/post page, and only increment if this exit is enabled
			$theexit = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM ".$wpdb->prefix."exit_splash WHERE id = $pid" ) );
			if ($theexit->close_window_mainpagerb == 1){ //internal
				if ($theexit->close_window_state == 1){ //exit enabled
					$sql = "UPDATE ".$wpdb->prefix."exit_splash SET close_window_actions=close_window_actions+1 WHERE id='".$pid."'";
					$wpdb->query($sql);
				}
			}else{
				//external exit page
				$sql = "UPDATE ".$wpdb->prefix."exit_splash SET close_window_actions=close_window_actions+1 WHERE id='".$pid."'";
				$wpdb->query($sql);
			}//end $theexit	

			//delete this cookie
			setcookie("exitsplash_tracking".$pid, "", time()-60*60*24*100, "/");

		}//end cookie

	}//end type
}
?>

This is the HTML code that loads on the page which initiates the tracking.

<div id="ExitSplashTrackingPixel"><img width="1" border="0" height="1" src="https://www.domain.com/wp-content/plugins/exitsplash/dbedit.php?pid=1&t=init&1331700559307"></div>