I am guessing that the new Use improved save and fill is what is wreaking havoc on 90% of the sites I try to login to - won't autofill - if I select a user, it doesn't fill it - sometimes it will fill in the name but not the password - etc. I would like to disable it but if I select Advanced Options -> Manage your Vault and try to deselect "Use improved save and fill" it doesn't do anything, it stays selected.