Mozilla Thunderbird is an invisible application ?!?!?!

??? ??? ??? ???

Date/Time :2007-02-21 20:26:38
Severity :High
Reporter :Application Monitor
Description: Suspicious Behaviour (thunderbird.exe)
Application: C:\Program Files\Mozilla Thunderbird\thunderbird.exe
Parent: C:\Program Files\Mozilla Thunderbird\thunderbird.exe
Protocol: UDP Out
Destination: 192.168.1.1::dns(53)
Details: C:\Program Files\Mozilla Thunderbird\thunderbird.exe is an invisible application

What is going on here??

Actually I would also like to mention that a lot of app seems to be blocked when doing DNS queries especially when a rule exists. Is that normal. Sorry 2 questions in one.
Such as:

Date/Time :2007-02-21 00:38:34
Severity :Medium
Reporter :Application Monitor
Description: Application Access Denied (jusched.exe:192.168.1.1: :dns(53))
Application: C:\Program Files\Java\jre1.6.0\bin\jusched.exe
Parent: C:\WINDOWS\explorer.exe
Protocol: UDP Out
Destination: 192.168.1.1::dns(53)

Could the fact that another app launched it, makes TB an “invisble” app ? hence the alert?
What is an invisible app?
thanks