Glad they found out what it was. This had been doing my head in for the past 24hrs. Chrome was practically useless and Firefox didn't like anything related to google (including searches opened in a new tab).
At first I thought it must be something on my network/SP. Then I spent ages checking & disabling any extensions and ABP. Nothing I did seemed to make any difference. I'd even checked to see Windows hadn't done a silent update (despite me having auto update switched off) but nope nothing for over a week.
Not sure how many members of this forum use MBAE, but I would have thought with it being a techie type forum, that quite a few windows users would have been affected :/