[CentOS] Kernel Update and Ultra Monkey

Hi,

We currently have an CentOS 4.5 running Ultra Monkey box serving web requests to two real servers. Info as below :

ipvsadm-1.24-6 heartbeat-2.1.2-3.el4.centos CentOS 4.5(kernel-smp-2.6.9-55.0.6.EL)

All was working fine this morning until I upgraded our OS and patched the kernel to kernel-smp-2.6.9-55.0.9.EL via YUM(CESA-2007:0937). After that users started complaining that they were being switched from one real server to another ie sessions weren't sticking. Nothing has changed on the Ultra Monkey configuration.

Has anybody experiences an issue with this kernel causing UM problems?