Upload 404 with 2.3

After upgrading to 2.3 the Upload section in WRITE POST is screwy.

I get a 404 error.

Here is a screenshot:
https://farm2.static.flickr.com/1224/1476715261_8457befddb_b.jpg

Also here is a screen shot of upload.php:

https://farm2.static.flickr.com/1215/1477575514_844789e530_b.jpg

So it works, but only sort of.

Any ideas?

Thanks!