This is odd. I can sign into and open my Identity Safe when browsing the web, but when I try to configure Identity Safe by opening Norton Internet Security - Settings - Web - Identity Safe - Configure the Vault Closed pop-up appears. I type in the correct password, click Open and the vault icon spins for a second or 2 and then reverts to the sign-in box. I do not see an incorrect password link. I can also sign into my Vault online via my Norton account.
The reason I wish to configure Identity Safe is because its toolbar has disappeared from Chrome and Firefox and is only present in Internet Explorer (where it works). The Norton Secured icon does appear top right in both Chrome and IE.
Interestingly, despite the Identity Safe toolbar being missing from Chrome and Firefox, if I reach the login of a website that is stored in my vault, Identity Safe logs me in, so it must be running in the background.
This all occurred since I reverted from Windows 10 (which I could not get on with) back to Windows 7.
To sum up, as there is a lot of different information above, whilst logged in to my Identity Safe Vault, I am unable to configure its settings in Internet Security, as the password opening procedure does not operate.