Ok, guys, so something really weird is going on. Recently both of our iMac computers started suffering from the throes of pop-up ads and other advertisements when using the web. This occurs on both Chrome and Safari I have tried deleting any extensions installed but to no avail. My family have said that none of them have downloaded anything recently, although I don't have 100% faith in their ability to navigate the internet safely, but it seems odd that it would happen on both computers unless they did something dodgy twice. Most of the ads are getting past adblocker. Any help would be much appreciated because I'm really stumped on this one.