[TYPO3-english] Yet Another Gallery images not showing

[Miguel]

Greetings,

I have installed this YAG extension to put some gallery in my website, but when i create the gallery's in the backend, the frontend does not display the image thumbnails or the lightbox "animation" when i click in the image...If i click in the right mouse button and open the image in another page, the page is displayed and can be downloaded, so i guess something must be missing...

Here is a printscreen of the problem:
http://imageshack.com/a/img839/2591/15g8.png

Kind regards