Thanks much for the reply.
So, this strikes me as incredibly subtle, and likely a bug
Should I file a ticket?
One way to fix this is to manually construct a ViewPoint rather than a Viewable and pass that to the client.
If someone would be willing to supply a very simple demonstration of this I would appreciate it very much.
But I do think that we should find a way to make your use-case work, to, or at the very least document the reasons why it doesn't in a comprehensible way...
I am willing to help but as of right now I only know how to use perspective broker; I do not know how it works under the hood. I have been collecting notes on bugs in the perspective broker documentation. I promise to submit a documentation patch when I have a first draft of my project up and running. Regards, Daniel Sank