Norton Internet Security Says I am At Risk?

This evening when I started my Mac, Norton Internet Security popped up and said that my Mac is at risk because my vulnerability definitions are out of date. Clicking the "Fix Now" button runs LiveUpdate, but LiveUpdate says my product is up to date. Once the "fix" is completed, clicking the "Done" button just takes me back to the original screen that says my Mac is at risk from vulnerabilities. The product update logs do not show any suspicious activities nor problematic updates. Does anyone else have the same issue? Is there an issue with the latest update from Symantec?

Thanks for any assistance.