I have this problem too and wait for Avast to fix whatever was introduced in an update that created this new problem. In other words, with WebRep active there was no problem with iGoogle before the past few days. And there is still no problem with iGoogle using other browsers.
I like WebRep and hopefully someone will post here when they notice iGoogle works with WebRep enabled. As an aside, in the past I've had multiple periodic browser problems with a similar type of service, McAfee Site Advisor, which I uninstalled a long time ago.