Over the last week, I've noticed that a box resembling a McAfee 'box' (for lack of a better term) will show up on my home computer screen, at various times, and on certain sites (this one, for example). It's right in the center of the screen, and the only way to clear it is to close out Google Chrome and relaunch. Some times, it comes back quickly. I know of the computer types' aversion to mcAfee, but it's not the same CPU I have Avast on. I also have Malwarebytes on this PC, and I ran a scan last evening, with it being clean.
I'd have to actually demonstrate what happens to get anyone to understand it, I'm afraid, but does anyone have a (more) educated guess as to what might be the problem?