Running Nagios XI 2012R2.9.
[root@nagios ~]# cat /proc/version
Linux version 2.6.32-431.5.1.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Wed Feb 12 00:41:43 UTC 2014
It's been a while since I set it up but I'm pretty sure I used one of the VMWare images offered at the time.
Nothing too special about the setup; we use SSL for the web portal but not for any monitoring.
The issue I have is this:

The host (and its services still show) but:

I deleted them AAAAGGGGEEESSS ago and they won't disappear.
Since deleting them, I've added and deleted many other hosts and services and they all come and go just fine... it's JUST this one host that won't bugger off.
Any assistance appreciated.
Cheers.