I have the same problem. I updated the Key to the lastest version on my secondary Win7 PC. After upgrade I could not log in with master password, typing the password > nothing happens. I repaired the installation without help. Removing all F-Secure apps is not the answer! FIX THIS NOW. I'm paying of this service. Luckily I didn't upgrade my primary Win8.1 PC which I need daily. I would be lost if Key is not available. As F-Secure Partner this is gives bad reputation to us since we are the one talking about to customers to use Key.
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