Thanlk you for your response. As per my other post see below for the resolved issue:
I have resolved my issue, and this was a real head slapper for me…
I was "disabling"the rate-limit in usermanager by setting values to 0 which of course in router os means that the queue should be created and then set to unlimited… doh…
Sorry guys.
Anyway, simply deleting all text/numbers from the userman rate-limit fields and leaving them blank fixed the issue.