Here's an odd thing, odder than me talking to myself...
If I uninstall the newly compiled APK and download the app from the store again (one that was compiled with an older version of AGK) the notifications using the new PHP code/setup go through but they come through blank. It has the App name and icon on it but the message is blank. I can understand and accept that because the $fields array has changed from:
$fields = array('registration_ids' => array($deviceToken), 'data' => array("message" => $message, "title" => $title),);
to:
$fields = array("to" => $deviceToken, "notification" => array("body" => $message),);
But this finding just tells me that there seems to be a bug with the latest version of AppGameKit because it doesn't even send a blank notification, instead it just crashes the app.
@Paul can you or someone in TGC confirm please?