Well since you are the first person I've seen with this complaint, my first question would be what do the two systems have in common?
It's a common misconception that because a piece of software didn't cause a problem yesterday it's immune from scrutiny today. I'm not saying norton is the problem, but it's not outside the realm of possibility either.
If it is a common factor between the two systems. The possibility a update or change is preventing a component of chrome from working properly is a bit more likely as well.