The only possible reason, other than a bug in our system, where access to a data source could have been removed is when there is a change in your AAF account or credentials. Please let ARDC know if you could not access your data sources and we will help sort out the issue with your account.
As a proactive measure, the ARDC system notifies ARDC services when a new, unregistered or non-identical (e.g different name, new identifier) user has logged on to the RDA Registry. This triggers the validation of account holder's authority to access the system and ARDC Services edits the account based on an existing access or a new request (for a new user).
If you still have issues, please contact services@ardc.edu.au.