If you do look to upgrade it - I think it's going to be the alert feature that is broken in it. I found this in my error log for nginx.
2013/08/07 20:29:49 [error] 16101#0: *40866 FastCGI sent in stderr: "PHP message: XML-RPC: xmlrpc_server::execute: function get_alert_func registered as method handler does not return an xmlrpcresp object" while reading response header from upstream, client: 64.188.196.60, server: twowheeldemon.com, request: "POST /mobiquo/mobiquo.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "twowheeldemon.com"
Apparently phpBB plugin has had the same problem and the response was "don't worry about it - it was probably a network error".
My Just Say Apple site has
2013/08/07 20:07:43 [error] 26769#0: *40693 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined variable: request_method_name in /var/www/apple4me/mobiquo/push.php on line 61" while reading response header from upstream, client: 50.17.254.140, server: sayapple.com, request: "GET /mobiquo/push.php HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:15:24 [error] 26766#0: *40789 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined variable: request_method_name in /var/www/apple4me/mobiquo/push.php on line 61" while reading response header from upstream, client: 50.17.254.140, server: sayapple.com, request: "GET /mobiquo/push.php HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:19:08 [error] 26773#0: *40801 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined variable: request_method_name in /var/www/apple4me/mobiquo/push.php on line 61" while reading response header from upstream, client: 50.17.254.140, server: sayapple.com, request: "GET /mobiquo/push.php HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:23:45 [error] 26773#0: *40891 FastCGI sent in stderr: "PHP message: XML-RPC: xmlrpc_server::execute: function get_alert_func registered as method handler does not return an xmlrpcresp object" while reading response header from upstream, client: 64.188.196.60, server: sayapple.com, request: "POST /mobiquo/mobiquo.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:23:45 [error] 26773#0: *40891 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined variable: rt_alerts in /var/www/apple4me/mobiquo/include/get_alert.php on line 100" while reading response header from upstream, client: 64.188.196.60, server: sayapple.com, request: "POST /mobiquo/mobiquo.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:29:22 [error] 26773#0: *40952 FastCGI sent in stderr: "PHP message: XML-RPC: xmlrpc_server::execute: function get_alert_func registered as method handler does not return an xmlrpcresp object" while reading response header from upstream, client: 64.188.196.60, server: sayapple.com, request: "POST /mobiquo/mobiquo.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
2013/08/07 20:29:22 [error] 26773#0: *40952 FastCGI sent in stderr: "PHP message: PHP Notice: Undefined variable: rt_alerts in /var/www/apple4me/mobiquo/include/get_alert.php on line 100" while reading response header from upstream, client: 64.188.196.60, server: sayapple.com, request: "POST /mobiquo/mobiquo.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "sayapple.com"
Needless to say - I'm going back to the 1.7 version of the plugin.