AutoCAD and possibly other applications have the potential to be affected by a bug in newly released .NET Framework 3.5 SP1.
We get a System.ExecutionEngineError after installing the dotnet framework 3.5 SP1.
Calculations of Vector3d.MultiplyBy , Vector3d.DivideBy and Vector3d.Add are totaly wrong.
According to Autodesk this is the workaround:
Create a file called acdbmgd.ini in the AutoCAD installation directory with the following 2 lines of content:
---start of acdbmgd.ini----
[.NET Framework Debugging Control]
---end of acdbmgd.ini