There is any chance to upgrade to CentOS 6.3? Officially, we don't support CentOS 5.9. According with the information from README.txt file we support only next distributions:
32 bit
2.1 RedHat Enterprise Linux 5.4
2.2 Ubuntu 8.04
2.3 Ubuntu 9.10
2.4 Fedora Core 11
2.5 Suse 11 Server
2.6 RedHat Enterprise Linux 4
2.7 Ubuntu 10.04
64 bit
2.8 RedHat Enterprise Linux Server 5.4
2.9 RedHat Enterprise Linux 4
2.10 Fedora Release 11
2.11 Suse Linux Enterprise Server 11
2.12 Ubuntu 10.04
2.13 Ubuntu 11.04
2.14 CentOS 6.3
2.15 libexpat system library
Regards,
Marius