If you have a XEN server on which Console, CPU and Memory usage not showing then you are in right place to get the answer of this question "No Console in XenCenter", I tested this solution on This XEN 6.5 which worked like a charm even solution will work for XenServer 7.0 / XenServer 6.2.0 / XenServer 6.5.
Unable to access the VM console via xencenter or via xe console command
XenCenter Console Tab not working, Console tab stays blank in xencenter.