It shouldn't be, but I've noticed that the "request" seems to get denied except under certain circumstances. I'm going to do a bunch of tests in a few to see which, where, and when that happens. I'll keep this thred posted.
*Edit*
Okay, I just went through a series of preliminaries, and I notice that rNT is behaving much better than the last time I tested it (before, it didn't seem to work from Anchor tags' 'onclick' event, only button inputs -- now it works for both). The difference is, the surface or view names have changed a bit. They are:
var views = gadgets.views.getSupportedViews();
var homeView = views['home'];
var rightProfileView = views['profile.right'];
var leftProfileView = views['profile.left'];
var canvasView = views['canvas'];
You can jump from canvas to canvas, to refresh the page with new parameters, and I'm able to get from Canvas to both Profiles. If you move from Canvas or Profile to Home, the VIEWER must have the App installed, because it takes them to their own Home page -- this makes the Home rNT rather limited, but useful if you're only using the Canvas for OWNER == VIEWER situations, such as an extended settings page.
I should note that I always did these tests with something in the opt_params; usually an empty object. The MySpace implementation seems to be sensitive to missing parameters, even if they are considered optional. I'll keep trying different things, but it would be helpful if you posted a code snippet if you're still having problems.