Hi All I seem to be having a problem with Layer
Manager, every time I type "layer" into the command line, in autocad
2010, autocad crashes and the following error appears in event viewer .NET Runtime version 2.0.50727.3603 - Fatal Execution Engine Error (000006427F44AE16) (80131506) Has anyone had this problem before ?

This is most likely a .Net problem, not an Autocad problem. Check the Microsoft Support site for a solution. http://support.microsoft.com/kb/913384