Hello essexboy,
No, I do not use LAN, but all the settings in the IE9 are just like you have described, I haven't made any changes. Are there any settings I should check in Firefox, too?
By the way, fingers crossed, for some inexplicable reason, I had no pop-ups today. For the last past days, they have been driving me crazy, yesterday evening I ran all the tests, provided necessary logs, today I turned on the computer... and Avast has remained silent. Weird. Did those tests reset some settings or something like that?