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]Joe72012-04-15 14:47:49
dont know if i can help, i was having this problem too and it seemed to go away, things in my game didnt seem to be working either, certain bits of code not firing, like maybe i had too many on tick events
when i got the message i would simply test again and it would work the second time but then it would come back when i changed something in the code, and have to test it twice again maybe clean up some code and it might go away,