Hi Ed,
I'm not sure if we're talking about the same thing here?
I mean that if my HTML page, JS scripts (etc) are stored on my laptop, Bing won't show when I open the map. If I copy the whole set of code (otherwise untouched) onto a web server, Bing suddenly shows.
This isn't reproducible with the simple samples, so there's evidently something more complicated going on.
Anyway, it's not a show-stopper for me. As a workaround I can test locally using v2.5, then make the change to 2.6 when uploading to the web server.
Cheers,
Steve