When your sign-in code could not be emailed, the page told you it had been sent, and you were left waiting for mail that was never coming. It now says the send failed, so you know to try again instead of watching an empty inbox.
Asking for a new code no longer costs you the one you have either. If a resend fails, the code already sitting in your inbox keeps working.
Submitting your email address on the sign-in page sends the code straight away, and the code page names the address it went to.
Leaving a playlist's Content tab before saving asks you to confirm, so the items you added and the order you set are not lost to a stray click.
The light and dark logo previews in workspace branding showed a broken image instead of the logo you uploaded.
A folder you just renamed, or an app you just installed, now appears in a playlist's Add content dialog without reloading the page.
Apps on API v4 and v4.1 now include description, icon, author, homepage_url and categories, so a catalog built on the API no longer needs a second source for them.