This update includes the resolution of over 70 issues. This section of the readme documents the resolved issues that previously caused loss of data or unexpected failures of Civil 3D, or reflect a change in functionality.

• Several issues that prevented the AUDIT command from working properly have been resolved.
  
• Selecting a large number of civil objects in a drawing with the Object Properties window set to Autohide no longer causes the program to close unexpectedly.
  
• Opening a drawing after adding a new tool to the Toolbox no longer causes the program to close unexpectedly.
• Slope stake reports now display the correct Grade value.
• An issue with polylines not retaining their settings has been resolved. Previously, linetype settings would not remain defined when a drawing was saved and reopened.
• Previously the program may have closed unexpectedly when you selected File > Save As, or used the Save As command to change from a template to a drawing format.
• An issue with migrating point group data from previous versions of AutoCAD Civil 3D has been resolved. Previously, opening a drawing with point group data resulted in the program closing unexpectedly.
• Using the WBLOCK command to select and insert a drawing that contains pipe network parts in profile view now works as expected. Previously, attempting to insert a WBLOCK with pipe network data in profile view would result in an "Invalid" message and the insertion would not occur.
• Use of the following workflow no longer results in an unresponsive drawing or an unexpected closing of the program:
  1. Create a drawing in AutoCAD Civil 3D 2009.
  2. Save the drawing in AutoCAD 2000 format.
  3. Open and save the drawing in AutoCAD 2006 (or earlier version of AutoCAD).
  4. Reopen the drawing in AutoCAD Civil 3D 2009.

• Setting a feature line style when you create a feature line from a polyline now works as expected. Previously, the style would be ignored.
• The XRecord attached to a point group in the API extension dictionary in a Civil 2008 drawing can now be accessed in Civil 3D 2009. Previously, the XRecord to the point group did not migrate correctly.
  
• The feature line name value can now be changed using the API. Also, the minimum grade value no longer incorrectly displays the minimum elevation value.
• AeccAlignment::MoveToSiteless works as expected.
  
• The Profile View ElevationMin and ElevationMax values can be set as expected. You must set the ElevationLocked value to True before setting the ElevationMin and ElevationMax values. Use the following settings:
  oProfileView.ElevationLocked = True
  oProfileView.ElevationMin = -50.0
  oProfileView.ElevationMax = 200.0
  

Corridor Design and Subassemblies

• An issue with using the Profile Grid View panorama vista to edit profiles has been resolved. PVI elevation edits in the Profile Grid View are now reflected in the Corridor node on the Toolspace Prospector tab.
  
• Volume reports are now generated as expected. Previously when generating a volume report for a cross section, the volume calculations were incorrect.
• Using the Apply To A Range Of Stations dialog box to specify a station range for an assembly override, and then selecting the corridor and expanding the View/Edit Corridor Section toolbar, no longer results in an error. Previously, the error dialog box would redisplay multiple times. In addition, attempting to save the drawing would result in the program closing unexpectedly.
• Material volumes are no longer missing from section views. Previously, the Cut Area, Fill Area, and Fill Vol properties displayed a value of zero.
  

• Sample line vertices are now reported from left to right when working with sample line data through the API. Previously, the vertices may have been reported out of order.
  

• An issue with Stepped Offset command has been resolved. Previously, the Stepped Offset command would not get the correct reference elevations from the source feature line if the number of points on the offset feature line was less than the number of points on the source feature line. It would use zero as the reference elevation.
  
• Creating a grading feature line from a corridor and using the Smoothing parameters in the Create Feature Line from Corridor dialog box no longer returns incorrect results. The feature line is smoothed as expected.
• An issue with the Smoothing options in the Create Feature Line From Corridor dialog box has been resolved. Setting the Horizontal deviation, Arc inclusion distance, and Weeding distance parameters results in straight line segments displaying as expected.
• An issue with opening a drawing containing grading objects and pipe network data references has been resolved. After opening a drawing containing pipe network data references, use the AUDIT command before working with the data.
  
• The program no longer closes unexpectedly when you paste one surface into another surface with the option for automatic rebuild selected. Previously the program might close during the rebuilding process after new grading objects were added to a grading group.
• Using the Explode command on feature line arc segments created in Civil 3D 2008 no longer results in straight line segments. The Curve Tessellation: Mid-ordinate Distance setting on the 3D Geometry Tab (Site Properties Dialog Box) is enabled for editing and controls how closely the arc segment is approximated.
• An issue with creating grading transitions from straight line segments to surface targets has been resolved. In AutoCAD Civil 3D 2009, the ability to grade to an absolute elevation target from a straight line segment was enhanced to improve the resulting daylight line. Previously, this enhancement resulted in possible incorrect results when creating transitions from straight line segments to surface targets. Grading from straight line segments to surface targets now works as expected. Use the following registry key to enable the ability to grade to an absolute elevation target from a straight line segment to function as it did in AutoCAD Civil 3D 2008:
  HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\R17.2\ACAD-7000:409\AEC\5.7\AeccLand60\EnableNewTransition = 0
  
  Set this option to 1 to allow the AutoCAD Civil 3D 2009 transition rule to be used for grading to an absolute elevation target (default if setting is not present).