Thanks for the quick reply. I had a read through some of the other support issues and already increased the sync time to 1440 minutes three days ago and this hasn't solved the issue. I also changed the fb remote data function two days ago as per another of your support tickets (see bottom of post) and this also didn't solve the problem.
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I ran your debug script and received the following:
"message": "(#4) Application request limit reached",
Does the plug-in use an API and is it perhaps being maxed out by other users?
This is the steps to replace the function I used:
1. open srizon-fb-album-front.php (or srizon-fb-album-front-pro.php in case of pro version)
2. locate the last function 'srz_fb_remote_to_data'
3. replace that whole function with the following version (assuming you have curl library enabled on your server)
echo 'getting remote data from:'.$url;
require_once (dirname(__FILE__) . '/mycurl.php');
$fbcurl = new SrzFBMycurl($url);
$data = $fbcurl->tostring();
echo "\n".'wp_remote_get and curl failed to get the api response. either the pageid or albumid is wrong or your server is blocking all remote connection functions!';