Google Chrome hijacked a coworker's session today.

I was informed by our Chief Engineer today about a strange problem one of our employees encountered. The employee downloaded the latest release of chrome from the main download page and installed it. The employee then proceeded to sign into chrome sync, and when they pulled up the main google homepage, they were logged in as the personal account of a coworker. These people never shared a computer, and while they do have similar first names, I genuinely suspect that google doesn't base sessions on first names.

All we can figure is that the user who was hijacked had logged into their gmail the other day and when the other employee came in this morning and connected to the wifi, DHCP assigned them the same IP, and google just continued the session which had been left open.

Has anyone had any experience like this? It's a bit concerning because these weren't corporate accounts or anything, and the employee had full access to the google account of the other without having to know the password.

The problem disappeared when we tried clearing stored data and reinstalling chrome.

The employee hadn't used the computer displaying this behavior in a while, is it possible that a session collision happened? The fact that it was another employee leads us to believe that it was somehow linked to the corporate IP address.

Any ideas?