During today's Civil 3D webcast, Dave Simeone, Autodesk Civil 3D Product Manager, mentioned that a problem(s) had been found with Service Pack 2 for Land Desktop (He was not specific about the issue(s)). So, Autodesk has removed the download from the website.
He stated that if anyone has downloaded the Service Pack but has not yet installed it, do not install it. They will be posting a new Service Pack as quickly as possible.
There was no mention of what those of us that have already installed it should do. If you have, and are having issues, I am guessing that an Uninstall/Reinstall may be the best course of action.
To reiterate this only has to do with Land Desktop 2007 and Service Pack 2.