Some users have reported that header images have degraded in quality after uploading. We're investigating this and will report back as soon as we have more information to share.

Thanks for your patience.

Update, 1/25: This issue has been fixed. Your previously-uploaded header images should now display clearly.

We've identified a bug that prevents the new editor from loading, instead displaying a spinning circle. The underlying cause of the problem has been identified, and we are deploying a fix now. As a temporary workaround, you can still post using the old post editor (the preference can be changed under the Settings | Basic tab).

Thanks for your patience, and things should be back to normal shortly.

Update 1/6: The underlying issue has now been resolved and the new editor should be working again.