When I went through the long way of updating my installation from 3.6.15, I noticed that the entire interface now looks very different–also, there was no database updated needed–it said my 3.6.15 database was up to date, even though I downloaded the 3.6.16 files and logged in with the new version.
Another issue was that the CKEditor was available, and I could not edit html, nor could use “view source” and paste an html email into a new campaign.
What is up with this new update?