Am Sonntag, den 24.02.2008, 12:13 +0100 schrieb Niko Matsakis:
> If I download a brand new Squeak executable (3.8.18beta1U, Mac) and  
> dev image (3.9-7067dev08), I am unable to browser the implementors of  
> a method.  It's easy to test: just start the image, open a browser  
> window, and type printOn: (or any selector).  You will get a Message  
> Not Understood error: OBImplementorsBrowser #implementorsNav:
> 
> Am I doing something wrong, or is this a bug in OB?  Perhaps I need a  
> newer Squeak executable (I see the version numbers don't quite match)?  
> I haven't had much luck running the Mac OS X image for 3.9 which is  
> based on unix sources, however: it just goes into some kind of stalled  
> state and no window ever appears.
> 
> 
> Thanks!
> 
> Niko Matsakis
> 

It is a bug in OB.
You have to update some OB Packages (at least OB-Standard-Browser).