We're seeing posts that existing Blend playlists can't be accessed anymore and that folks are also unable to accept new Blend invitations. Reports also mention that the app just goes back to the Home page or gets a loading screen after clicking on the invite button. This is happening on both iOS and Android devices.
Thanks for your patience while we looked into this issue.
The initial cause for blends not working has been resolved.
We're seeing a mix of several different reports here, so we'd recommend that raise them in separate threads so they can be looked at on their own merit.