If you have had problems with the Osnap setting dialog box in 2010, here is the solution!

AutoCAD® MEP 2010 Update 2
Published date: 2010-May-28
ID: DL15135406
Applies to:
AutoCAD® MEP 2010
AutoCAD® Revit® MEP Suite 2010

solution can be found at this link
http://usa.autodesk.com/adsk/servlet...linkID=9240938