Active Directory Network Account does not have login keychain

You might be out of luck. Sounds like the AD authentication isn't caching your credentials locally so you can login when you're away from your AD server.

You can go brute force on the problem:

Hold down the power button your MacBook Pro for ~5 seconds until the machine shuts itself off. Power it back on and use your local credentials to log in instead of your AD credentials.

Once you're back up and running run /System/Library/CoreServices/Directory Utility. Click the lock icon to unlock the settings. Highlight Active Directory in the list and click the pen icon to edit the settings. In the window that pops up click the Show Advanced Options and make sure that Create mobile account at login is checked. This ensures you can login when the AD server isn't present.

I think Keychain Access is caching the old login info and causing problems each time the info changes. Try deleting the existing login keychain and creating a new one and see if that resolves the problem. Everytime the AD login info changes the keychain needs to be manually updated to reflect those changes or this kind of problem will persist.