A HotFix is now available on the Autodesk Support site for the Sheet Set (0 dst) issue that several users have encountered. This fix applies to: Autodesk® Architectural Desktop 2005 and Autodesk® Building Systems 2005.
The link to the download is: http://support.autodesk.com/getdoc.asp?id=TS5273141
If multiple users make simultaneous modifications to a project, the Sheet Set Template (.dst) can become corrupt. In this scenario, the dst file associated with the project is reduced to 0 KB in size and users are unable to modify existing sheets or create new sheets within this project.
This updated version of the AecProject45.arx file addresses this issue and prevents future instances of this problem.
Be sure to review the readme file before installing...