Cliche disappeared in backend!?

I installed the Cliche gallery, and I finally got it to work with pagination and my css, and all of a sudden, the Cliche album manager doesn't show up in the Components anymore! All there is, is an empty space, where you normally see the albums, upload the pictures etc.
I can't recall to have changed anything within the code, other than the css.

Please help, what can I do to make it appear again? I already tried to reinstall it, still nothing.

Thank you!!

Ok, I found the problem: I DID change something, and it was the link to lightbox.js that caused the Cliche to disappear. I now linked to slimbox2.js instead, and everything works again Looking into the Chrome dev tool and the console helped me!