Strange error with "update_profile_background_image" - 404 Not Found


#1

My app was sending profile background images for years, but now it has a problem.

API call has regular return:
Response code is 200.
[profile_background_image_url] => http://pbs.twimg.com/profile_background_images/435409141532594176/GGfaA2Bl.jpeg

However, background image is always 404 Not Found.
Sending tweets, etc is OK.

Any ideas?