This is possibly/probably irrelevant to downloaders using rtmpdump.exe - unless some parameters need tweaking. I haven't explored that.
There have been some changes to iView servers that send the video stream down to us - particularly for those with unmetered ISPs - see iView Message Board,
here
According to that message, this will also affect devices and operating systems where the version of Adobe Flash Player (eg, installed into browser) is older.
For example, using PS3 devices to view iView shows through the Player website seems to cause the usually unmetered server to switch to a metered one.
I have discovered that for Windows, the latest Flash Player version is 11.8.800.94 (Internet Explorer, Opera, Firefox).
See
here for the latest version for Chrome and Linux (etc).