I just bought new LTE router for 100e, and it work like charm. No problems.
I wil ltry some more tests with mobile phone connection.
Maybe it was hardware issue ? Will let you know.
Thx for support.

Hello.

This problem is really not in the network, becouse when i open image in new window, it work perfectly. So its in the Javascript.
And i dont have any problems with any other webpage on internet.
And as web developper, you cannot sell software which is running only on your computer :)

I did some digging, and i think, that you are maybe somehow manipulating with the image before is fully loaded. Or the script finish before image is loaded. Becouse on 3g/4g the loading time is bigger then in your computer.

So its probably related with slow loading time. 

I must ask you, are you using some debuging? There are many articles with same or similar issues:
https://www.google.com/search?q=jquery+ … not+loaded
https://www.google.com/search?q=jquery+ … oken+image

Really thank you for your support.

Standalone image just after first screen loaded on fisrt try:

When i open standalone images, they load fully without problem.
I think, the problem is somehow in multi loading with multi headers in short time.

You are right, the problems is out of Juicebox.
I will try to dig deeper.

If i will find solution, I will let You know...

Thank You for Your time.

OK. I tried Chrome, IE, Firefox, Firefox for Developers. The same result.

I tried to do more analisys.
I am working for some time as Linux server admin, and HTML, PHP, Javascript, JAVA for Android developper. So i have some experience, but never saw this before. Its shows something like "partial content" with 206 return code.
So maybe its not problem of Juicebox. But i dont have problem with other websites and images.

So i tried to change .htaccess to:

<IfModule mod_headers.c>
        Header set Access-Control-Allow-Origin "*"
        Header set Cache-Control "no-cache, no-store, must-revalidate, proxy-revalidate, no-transform, max-age=0, post-check=0, pre-check=0"
        Header set Pragma "no-cache"
</IfModule>

But same results...

And i found connected issue, becouse i am using 4g LTE to connect my office.
https://juicebox.net/forum/viewtopic.php?id=2333

Plese look at attachment, you can see full headers on image, and 206 retun code.