I have my VPS that is configured not at all right way.

When I choose photo to the field Picture and press "upload" it show me blank image and when I open url address of this thumbnail - it shows 404. But when I save the post thumbnail shows correctly, so file creates.

Please why JS cannot upload and create thumbnail on fly?

I have my VPS with two sites: in first i have FileField Paths and it works bad. In second i have no FileFiled Paths and everything ok.

The error is this:

When I choose photo in the Image field and press "upload" it shows me blank image and when I open url address of this thumbnail - it shows 404. the thumbnail url is correct.

But the original image url is not corect. FileFiled paths make the original image url like this:

/system/temporary/filefield_paths/coctail-gold.jpg

but the pattern in Image field FileField paths settings is this:

blog_images/u[node:author:uid]/[current-date:custom:Y]

so this is the reasen why i see the blank image. 

But when I save the post thumbnail shows correctly, so file creates.

Please what is wrong with FileField Paths?