If you had an IP address licensing issue, I think you'd know real quick as you wouldn't be able to push a new policy to the firewall and many features would not work correctly. I doubt that is inhibiting your signature updates, much more likely to be the SHA-1/SHA-256 issue.
In the SmartView Tracker filter try filtering for log entries with a Type of "Control" (grey wrench icon), you should be able to find the exact error message about the update failing which should help.
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