Prior Version Alignment Spiral Hotfix

After installing AutoCAD Civil 3D 2010 Update 2, if you open a drawing created in a previous version of Civil 3D, which contains an alignment with a spiral curve, you may see the alignment change. This Hotfix will resolve this issue and will correct the alignment geometry.

Note: There are two different hotfixes for this issue. One is for users who have only Update 2 installed. The other is for users who have both Update 2 AND the Subscription Advantage Pack installed. If you are unsure which is appropriate for your application, please follow the instructions below to find out:

1. In Windows Explorer, browse to the Program Files directory:
   • Windows 32 bit – C:\Program Files\AutoCAD Civil 3D 2010
   • Windows 64 bit – C:\Program Files (x86)\AutoCAD Civil 3D 2010
2. Find AeccMath.dll in the list, right-click and select Properties
3. Note the version of this file:
   • Windows Vista or Windows 7 – under the Details tab
   • Windows XP – under the Version tab
4. Rename the existing AeccMath.dll file to AeccMath.dll.old
5. Place the appropriate file below in your Program Files directory:
• Users running ONLY Update 2 (existing version 7.0.1387.0):
    aeccmath.dll.SP2 (dll - 768Kb)
• Users running both Update 2 AND the Subscription Advantage Pack (existing version 7.0.2173.0):
    aeccmath.dll.SAP (dll - 768Kb)
6. Rename the downloaded file to aeccmath.dll

If after applying this hotfix with only Update 2 installed you then decide to apply the Subscription Advantage Pack, you will need to do the following:

1. Rename the AeccMath.dll file to AeccMath.dll.Update2
2. Rename AeccMath.dll.old to AeccMath.dll
3. Apply the Subscription Advantage Pack
4. Rename AeccMath.dll to AeccMath.dll.old
5. Download the AeccMath.dll which targets the Subscription Advantage Pack (above)
6. Place the file in the Program Files directory

For Update 2, if the version of AeccMath.dll is 7.0.1390.0, you already have this fix applied.

For Update 2 AND the Subscription Advantage Pack, if the version of AeccMath.dll is 7.0.2180.0, you already have this fix applied.