as far as I can see everything is right with cs6 - dreamweaver - but snapshots don't appear in browser lab. I receive the message,
"timed out failed to connect to browser lab", thanks Quinne
Snapshots don't tell me if the site performs well in all browsers so I never use Browser Lab.
I test in current versions of the 5 major browsers (Firefox, Safari, Chrome, Opera & IE). If client wants to support older IE, I use this multiple IE Tester.