Is project saving/loading broken?

http://stackoverflow.com/questions/11102702/export-and-sharing-smalltalk-projects/11103169#11103169

Steps to reproduce:
1. In Squeak 4.3, create a new project
2. Enter the project
3. Open a browser window in the new project (or drag a few morphs from the Objects flap - same result)
4. save from world menu
5. In another Squeak 4.3, load from world menu
"Key not found: MorphicModel4"

Sean