I cannot confirm this. The 'Preview' works fine in r85,r86
and Chrome (20.0.1096.1 dev-m), also in Firefox (11.0)
+) Do you have a firewall (that blocks this port or blocks a local webserver)?
+) Perhaps changing the preview port helps - perhaps other software use that port?
+) Have you used a custom plugin? If this throws an exception it can happen that nothings works..
What logs are in the Chrome-console? [(CRTL)+(SHFT)+ (I) in Chrome]