Welcome to the Norton Community.
What version of NIS do you have? You can find this from Support > About. There has been a recent version update to NIS which might be causing your issue but this is a phased roll-out which means that it is not automatically being pulled down via Live Update for all users - but rather selected users at first. This is standard practice for Symantec when releasing major version updates. Once Symantec's telemetry has indicated that the version is solid it then gets released to Live Update globally.
At the present time this update is only available to English users.
Please see the following post for details.
If you have the English version of NIS 2011 and you wish to do the update now you can follow the instructions in the above post and manually update to this new release. You may however wish to wait until this is formally released to everyone via Live Update.
You can also try disabling, save changes and reenable ID safe to see if this has any affect with your current version.
Hope this helps.
Can you provide some more details about what's not working? Is IdentitySafe feature in NIS not aufotilling logins and passwords anymore?
Is this not working with some specific web site you use or with all logins and passwords you had saved in NIS before upgrading NIS.
Please provide the website URL or any other additional information that might help.