I occasionally see the same on the firewall entry in my logs as well. SecureSpothas never been enabled on my router. Perhaps what is happening is: the routine which presumably sends the firewall settings to SecureSpot does not realize when the feature is disabled.
Similar behavior has been observed in my router in regards to the wireless schedule. It is set to disconnect all wireless at midnight, which is what actually happens. However, in the log, wireless does indeed go down, but then attempts to come back up and fails. It should be noted that the router works perfectly in the real world. Just we have these odd log entries.
This is only speculation on my part however.
Patrick
PS: My router is the D-Link DIR 655 with hardware version A4, firmware 1.33 NA.