The same thing has been happening to me today. I posted in a seperate topic here. I went through the threads you referred to, but at the risk of sounding stupid, what do I actually need to do? Is this just Avast FPing on ads in yahoo? How do I fix it? Is Avast going to fix it? I don’t want to undo webshield, but these popup warnings are driving me crazy, and they won’t let me change my My Yahoo start page.

Thanks,
Grey