I've been created a Photostream in Aperture and while it appears in my iPad 3, it does not appear in my other iPad 2 (model A1219). I've verfied that Photostream is set to ON, and the software is up to date. I also notice that in Settings>General>iTunes WiFi Sync, the "Sync Now" button is greyed out, even though my iMac is on, and the wireless network is working fine. Any ideas? I've attached a couple of screen shots of iTunes so you can see what's enabled.
I'm not sure what the difference is between a regular an shared photo stream. Within Aperture, I have a collection of photos. I selected all of them (in this cae, about 60), and clicked the Photostream icon.
When you click the "PhotoStream icon in the Toolbar, you should see this:
Have you used the default "My Photo Stream" or selected to create a new stream? A new stream would be a Shared Photo Stream and not available on IOS 5.1 devices.
Otherwise I am running out of ideas, sorry.