You may have noticed that after installing Civil 3D 2011 Update 1 that there is a “white box” around the ViewCube in the upper left corner of the application window. No need to fret, as this is outlined in the Update README:
Known Issues in AutoCAD Civil 3D 2011 Update 1
In some situations users may observe that the background area around the ViewCube has turned white. This issue is benign but can be resolved by turning video hardware acceleration on/off.
This even caused us in Product Support some confusion, but referring back to the README quickly cleared up any concerns.
One more reason to always read the README when installing a new version or update!