All VMs move no problem with the exception of 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 a space character in it.