After install of payment forms extension with no problems, all configuration pages not working.
PHP Built On Linux zcp.wctek.us 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64
Database Version 5.1.69
Database Collation utf8_general_ci
PHP Version 5.3.3
Web Server Apache/2.2.15 (CentOS) DAV/2 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips mod_perl/2.0.4 Perl/v5.10.1
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 2.5.4 Stable [ Ember ] 2-April-2012 14:00 GMT
Joomla! Platform Version Joomla Platform 11.4.0 Stable [ ] 03-Jan-2012 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36