At the very beginning, we gave the users the option to switch back and forth between versions, to assist in transitioning to the new editor. Later, the new version become the default for all new accounts. Even today there are still a minor number of accounts using the old editor.
Today we’re officially deprecating our advanced editor v1. Customers with the legacy version will be upgraded to the advanced editor v2 on Monday, May 20th, 2013. The support and code for the old editor will be definitively removed on Monday, June 3rd, 2013.
If you’re using the old editor and you want to upgrade today, please log and switch to the V2 editor or contact us. We encourage the users using the old editor to upgrading as soon as possible.