Norton Internet Security Has Suddenly Stopped Logging Firewall Event

My Norton AV's been working at tip-top speed and shape, so I was surprised to notice recently when I checked my logs that my Firewall Network and Connections and Firewall Activities event logs on my history are suddenly completely empty of events, even ones that occurred before the update.

 

It does say that my firewall is operational, and I'm getting the usual level of protection, but I find this very worrying, obviously.  My Norton has also been sending lots of dll files into the Norton Community Feedback Watch lately.

 

The copy on my other computer is operational, and I'm not noticing these issues.  It seems to have colluded with the Windows Live Assistant update of several days ago.  Is my firewall compromised?  How do I fix it?