This has been reposted from http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13778933&linkID=9273944&CMP=OTC-RSSSUP01
Published date: 2009-Aug-21 ID: DL13778933
Autodesk® Revit® Architecture 2010
Autodesk® Revit® MEP 2010
Autodesk® Revit® Structure 2010
revit_2010_wallmodification_hotfix_x32.zip (zip – 7584Kb)
revit_2010_wallmodification_hotfix_x64.zip (zip – 10224Kb)
revit_2010_hotfix_wall_modifcations_readme.htm (htm – 58Kb)
This hotfix addresses issues related to deleting or modifying walls, a crash may occur.
Make sure to download the correct patch for your operating system (32 or 64 bit).
The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.