AutoCAD 2011 Update 1 recalled
If you click on the link I posted about earlier, you will get this: 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: AutoCAD and AutoCAD LT Layer Manager Hotfix Please be assured …