On Sun, 8 Aug 1999 John.Maloney at disney.com wrote:

<snip>
> 
> For 3D, you need to put the Mac version of the "Squeak3D" plugin into
> the same folder as you Squeak VM.
> 

IIRC, there's an extension that has to go into System Folder->Extensions. 
When you unstuff the distribution, it ends up in the Squeak folder.
PlayWithMe7 gave me the same warning until I moved the extension.

-Russ