(This post is for use with the Google Chrome 37.0.2062.102 m browser on Windows (8.1)... I doubt the versions really matter.)
In case this wasn't already known...
When I have X-Notifier set to check multiple Gmail accounts... and ...I have Google Voice/Talk/Chat embedded in one of my Gmail accounts... then, when I'm logged in via tab ...X-Notifier appears to break my Chat session (drops the link/call/whatever). It's "Opps it appears ...etc".