There are scenarios where you could see a blank page while working with Rational Asset Manager (RAM). Once such scenario you might come across is a blank web page being displayed when you are trying to add a user to the Access Control black / white list in RAM via Administration > Configuration > Add user to Access Control [Black|White] list.
Failure to add user to the Access Control list issues can occur if the registered RAM user's information conflicts with the user registry information stored in your directory service protocol such as LDAP.
Are your users being managed via LDAP?
If yes, it is very much possible that the registered RAM user info conflicts with LDAP registry information.
You might as well see information about such failure to add the user to the list as an exception present in the log file. (the ramdebug.log)
This has been identified as a known issue and is logged as a defect
To resolve this:
- First resolve any user conflicts.
- Then try refreshing the page and attempt to add the user to the desired list.
You can find all the details on configuring users for LDAP integration here.