On my HTC sensation running 4.0 I had to do Menu->Settings->Advanced->Enable Flash and plug-ins->On demand [Always on would probably be ok too]
I also manually updated to the latest flash player but I don't know if that helped
Update: a project has been released which gets i-view working on Android: https://play.google.com/store/apps/details?id=com.github.aview.app&hl=en
