Problem with Browser Sampler Stack in Rev/Mac 2.8.1

[Bob Warren]

Bought myself a Mac Mini, Installed 2.8.1, navigated to the Browser 
Sampler.rev stack in 2.8.1-gm-1/Resources/Examples, activated stack, 
clicked on the "Launch Browser" button and got an error message "unknown 
browser id". :'(

Does it work for anybody else?

Ignoring the error causes a browser window to be opened, but of course 
it doesn't navigate to the Rev site as it's supposed to.

Is revBrowser supposed to be altBrowser shown in a new window instead of 
in an image box? Supposing I manage to get revBrowser working sooner or 
later, can it be shown within an image box of my stack rather than in a 
separate window? If not, I don't see an awful lot of point in it: I 
might as well call my platform's default browser to show the webpage.

Bob