Hmm... this is leading me to believe the lookup service is broken in some way. I don't seem to be able to see a lookup service specified in vCenter services in the webclient. Any idea's how I go about troubleshooting this and confirm its not behaving as it should. Strange thing is however I don't see any alerts in the infrastructure for a lookup service not working.
Thanks for all your help guys regardless, these forums are a life saver