Do you have corrupted project sheet set files? Do you have problems creating new sheets in existing sheet sets? Read more about this problem on Robinz Blog here. If you are experiencing these problems then you need the hot fix that has just been released.
Read about this necessary fix here at the autodesk download page.
Be sure to copy this new arx file to the correct location based on your product install folder:
Architectural Desktop: "C:\Program Files\Autodesk Architectural Desktop 2005"
Building Systems 2005: "C:\Program Files\Autodesk Building Systems 2005"
Want to automate this delivery? Check out Jimmy's post and his script to deploy this hot fix on JTB World.