LW started working again
 

LW was working wonderfully earlier. Now it's showing the little brick wall telling me I'm behind a firewall but nothing has changed. It seems as though it comes and goes as it pleases.

WRT54G router Linksys
wireless
4.10 LW
McAfee firewall (windows disabled)

Are your speeds, downloads & uploads all the same?
(this happens to me now & then but it never lasts for long & doesn't effect me in any way)
If everything's ok, I'd probably say ignore it but if your LW's not working properly, you might have to take a closer look.