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See: support.nagios.com/forum/viewtopic.php?f=7&t=58008

These changes fixed the issues for me.
#
# diff /usr/local/pnp4nagios/share/application/models/data.php-orig /usr/local/pnp4nagios/share/application/models/data.php
979c979
0 ){
---
> if(is_array($pages) && sizeof($pages) > 0){
#
#
# diff /usr/local/pnp4nagios/share/application/lib/json.php-orig /usr/local/pnp4nagios/share/application/lib/json.php
133c133
function Services_JSON_construct($use = 0)
783c783
function Services_JSON_Error_construct($message = 'unknown error', $code = null,
797c797
function Services_JSON_Error_construct($message = 'unknown error', $code = null,
#
#
# diff /etc/php.ini-orig /etc/php.ini
1670a1671,1673
> ; Added for pnp4nagios
> magic_quotes_gpc = Off
>
#
#

Thanks for a great plugin :)