Uncaught TypeError: Cannot call method 'concat' of undefined analytics.js:186
does it re-appear when you reload the page ?
is the work that is "in-progress" for 2.5 or for 3.0 release?
it's not actually in progress. Proposed fix was nacked for some reason I don't recall yet.
Triage - June 19 2014 Alk, Parag, Anil