On August 23, 2010, Autodesk released Update 1 for AutoCAD 2011. Unfortunately, Update 1 introduced an issue when conducting certain operations that may cause AutoCAD to shut down. This issue affects a small number of users.
We have removed Update 1 and will reintroduce it in the near future when the issue has been resolved. For customers who have already installed Update 1, the hotfix that resolves this issue has been posted at the following location:
Please be assured that Autodesk is wholly committed to the quality of AutoCAD, and regrets this error.
Having been pretty critical of Autodesk lately, you might expect me to dish out another serve for this. But I won’t. With the best of intentions, this stuff happens. Autodesk has done the right thing in recalling the update and providing a workaround for customers who have already applied it, and a fixed Update 1 should get released soon enough.