For you issue I have few things
1. Check weather the account you are logged in with have administrative privilages. if not assign admin privilages to it.
2. Might be your licenses have expired. in this case contact support for further assistance
3. restart the server service and try to go to license tab. It will be available for you for first 10 min in case of license expires.
If you still have something beyond this
do let me know
Already tried / checked all those things.
This doesn't appear to be a 'QVS Issue' but until we know what the QVS is trying to do that results in the errors we can't identify what to fix.
The amends to the AD Groups / Domain Controllers have been inherited from above so our DBA's aer unsure as to whats changed.
Thanks for the suggestions.