Hi Josh
I will link in your HP fault with mine tomorrow, the response HP have sent me was
"We would like to confirm that this is a known issue and VMware engineering is still working on the issue and expected release of ESXi 5.5 Update 1 is on 22nd Dec 2013, tentative date only. Workaround for now would be to restart services on ESXi host."
The reboot of the hosts has cleared the problems and Veeam is now backing up again and i have full control of the VMs back in Vcentre.
I am presuming that I will have to reboot again in 14 days, as if the uptime figure is 13 days and that the count effectively starts at 0, is that what everyone has found?
Doesn't really look like we have other alternative but to wait and apply the patch.