Thomas,

The plugin boxes are checked under each user. The tabs at the top are showing along with the associated links on the side. When I click on any link on the side or tab at the top, I get just a blank page..I checked the apache2 error.log, these are some of the messages that are showing.

[Wed Jul 11 14:06:07 2012] [error] [client 127.0.0.1] PHP Warning: include(): Failed opening './include/auth.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog.php on line 35, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:07 2012] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined function syslog_check_dependencies() in /usr/local/share/cacti/plugins/syslog/syslog.php on line 44, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:13 2012] [error] [client 127.0.0.1] PHP Warning: include(./include/auth.php): failed to open stream: No such file or directory in /usr/local/share/cacti/plugins/syslog/syslog.php on line 35, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:13 2012] [error] [client 127.0.0.1] PHP Warning: include(): Failed opening './include/auth.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog.php on line 35, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:13 2012] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined function syslog_check_dependencies() in /usr/local/share/cacti/plugins/syslog/syslog.php on line 44, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:14 2012] [error] [client 127.0.0.1] PHP Warning: include(./include/auth.php): failed to open stream: No such file or directory in /usr/local/share/cacti/plugins/syslog/syslog.php on line 35, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:14 2012] [error] [client 127.0.0.1] PHP Warning: include(): Failed opening './include/auth.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog.php on line 35, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:14 2012] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined function syslog_check_dependencies() in /usr/local/share/cacti/plugins/syslog/syslog.php on line 44, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Warning: include(./include/auth.php): failed to open stream: No such file or directory in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 26, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Warning: include(): Failed opening './include/auth.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 26, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Notice: Undefined variable: config in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 52, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Warning: include_once(/include/top_header.php): failed to open stream: No such file or directory in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 52, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Warning: include_once(): Failed opening '/include/top_header.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 52, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:20 2012] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined function input_validate_input_number() in /usr/local/share/cacti/plugins/syslog/syslog_alerts.php on line 582, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:22 2012] [error] [client 127.0.0.1] PHP Warning: include(./include/auth.php): failed to open stream: No such file or directory in /usr/local/share/cacti/plugins/syslog/syslog_removal.php on line 26, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:22 2012] [error] [client 127.0.0.1] PHP Warning: include(): Failed opening './include/auth.php' for inclusion (include_path='.') in /usr/local/share/cacti/plugins/syslog/syslog_removal.php on line 26, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:22 2012] [error] [client 127.0.0.1] PHP Notice: Undefined variable: config in /usr/local/share/cacti/plugins/syslog/syslog_removal.php on line 52, referer: http://localhost/cacti/plugins.php
[Wed Jul 11 14:06:22 2012] [error] [client 127.0.0.1] PHP Warning: include_once(/include/top_header