All VMs move no problem with the exception on 1. #

For some reason this single VM can not be dragged into another Folder within vCenter.

It comes up with a No entry style sign, whereas other VMs can be dragged and dropped as normal.

To resolve this, simply use the vSphere Power CLI as follows:

Start > Programs > VMware > VMware vSphere PowerCLI > VMware vSphere PowerCLI

Move-VM -Destination [NewDestinationFolder] -VM [vmname.domain.com]

Use quotes for the folder name is there is a space charracter in it.