Problem with Xbox360 profile

[Max-Powers]

My xbox360 has been unplugged from the internet for a long while. I play games that I have downloaded and paid for such as geometry wars and castle crashers. A friend recently plugged it into the internet, signed out of my profile, signed into his, and of course downloaded the latest xbox updates. Later, I signed out, signed into mine, unplugged the internet, and now it won't keep my profile logged in. And it is wanting the internet before it will let me log on.
So now I can't play the games I paid for without the internet. For me, plugging into the internet is not an option. Was there a new update that requires internet 24/7?