This one has been bothering me off and on since I started using the product. I use a laptop and when I reboot where there is no WiFi or Ethernet connection, I get this warning balloon two times after start-up. Frankly, that DF is frustrated that it cannot call home to check for updates (which is not that important) is not a reason to put up this warning. The user probably already knows he doesn't have network connectivity since things like email aren't working... If when the user presses the update button, well that's a different story.
I have removed this balloon from the auto-update check unless you manually start the update check (from the Settings window). This change will appear in Beta 9. Thanks!