That lab feature has been disabled by Google, much to the dismay of many users.
Please provide feedback on this to Google. Feedback is under the little gear wheel top right hand corner of the web page. "Send Feedback". -- You received this message because you are subscribed to the Google Groups "Gmail-Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to gmail-users+unsubscr...@googlegroups.com. To post to this group, send email to gmail-users@googlegroups.com. Visit this group at https://groups.google.com/group/gmail-users. For more options, visit https://groups.google.com/d/optout.
