I am not sure if this problem started as a result of the recent e-mail server outage/problem but I cannot 'turn on' the Spam Detector on one of my sub-accounts.

If I select 'On' the following response is returned:

No other information is provided; and the setting reverts to 'Off'.
The Spam detector is currently correctly set ('On') for the Main-Account as well as my other sub-accounts.
Any ideas ???