AutoCAD 2004/2005/2006 DWG Format

[#1]

hello,

I'm doing a research about the offset function in AutoCAD. I want to know, have anyone ever get a problem with the offset function in AutoCAD ? such as you didn't get the offset curves that you want or something odd appear like a cusp in your curves and something else ? If you ever experience that, could you give me the drawing that having the problem with the offset function

and I also wonder, does anyone know what algorithm used by AutoCAD to generate the offset curves ?

thank you !