Solved it.
It is an ISIS template problem.
Found the solution here.

Turns out to be an ISIS template bug...
Open the admin template ISIS and edit index.php file.

Where you find...
Code:
// Add JavaScript Frameworks
JHtml::_('bootstrap.framework');


Change to...
Code:
// Add JavaScript Frameworks
JHtml::_('bootstrap.framework');
JHtml::_('behavior.framework', true);

@MakXat: You are star! Thank you very much for your post!

Hello Rango, Problem solved.

Thanks!!

This tweak helped me too. I'm using Jooomla! 3.4.1 and the newest Gantry Framework.

Hi Guys, third attempt to post a question...

Is it possible the get the navigation arrows and blocks outside the image? Now they are in the picture. If I fiddle with the css, I can move the arrows but the cannot leave the image area. What are the options?

Thanks!

@Rutger: You can't move thumbnail image area to outside the main image area by using css. Because the module use javascript to set position for it.