Today I needed to turn off Symantec Endpoint Protection while working with another program. When I turned it back on, Proactive Threat Protection would not come back on. The status message says "Protection definitions are too old for Proactive Threat Protection. Click Fix to update protection definitions."
I clicked Fix and it started Live Update which ran correctly, and downloaded the latest definitions (dated yesterday). The Antivirus and Antispyware Protection section is ON and shows the definitions dated yesterday, but Proactive Threat Protection is still OFF and where the definitions date should be it says "Waiting for updates"
I ran Live Update again and it says that all products are up to date, but the status still says "Protection definitions are too old for Proactive Threat Protection. Click Fix to update protection definitions." and Proactive Threat Protection still says "Waiting for updates"