Wow!
Fast and precise answer. 

It's exactly what I tough, the gallery (Lite version) uses only 2 images. 1 for thumb, 1 for expand & normal state. So in order to get a high res image either upload a bigger image or go with the Pro version.

Thank you very much. You've answered perfectly my questions.

Hi there!

Great image gallery! I love it!

I'm using the lite version. I've got a problem with it. With some of my pictures when I click on the expand button the image do not show at high res or bigger as it does for the other ones.

I tried uploading a bigger image but the expand button only shows the same picture as before cliking on the expand button.
It's like it's not really expanding the picture.

On your demo page here it's working fine.
http://juicebox.net/demos/lite/embedded/

Can you share its config.xml?

Can you help me with that?

Thank you!