how's your system DNS settings?
Everything left automatic, as it was with F14. As an experiment I added the router address as the name server:
# Generated by NetworkManager
but this made no difference.
There seems to be nothing to get hold of to even start diagnosing this. At some level, it's all working, but only for Chrome & Earth. For everything else, it's not working even enough to say what's broken. The research I've done so far indicates that people have encountered a variety of problems one kind or another with moving to F16, but nothing out of the ordinary and nothing that accounts for this very specific set of symptoms.