revBrowser and modal stack

[jbv at souslelogo.com]

Hi list,
I am using revBrowser in a pop-up stack.
When I use "open stack mystack", revBrowserOpen works fine
and displays the requested webpage.
When I use "modal stack mystack", revBrowserOpen doesn't
seem to work, as nothing displays. In both cases an integer is
returned by revBrowserOpen, which means that nothing went
wrong...
I'm on OSX 10.5.8 for the moment, and the problem is the
same with LC 4.5.3 (on which the stack was originally made)
and LC 6.5 .
What am I missing ?

Thanks,
jbv