If you're someone who has a cooperative browser, then you already know that several hours ago the backgrounds were changed for September:
The original series:
The original movies:
(Notice how this month's background includes a deleted scene. And also, the reason why Quentin's dream is a part of this month's background is because the scenes come up based on the script and not the way they appear in NoDS as it was released.)
And the '91 series:
But if your browser didn't cooperated, you'll need to clear your browser's cache ASAP.