Fixed it, if anyone else comes with this problem go here and theres a fix for slimbox2.js https://code.google.com/p/slimbox/issues/detail?id=36
Basically happens because of an old jQuery version included with Slimbox which needs 1.9 or higher I believe.
The Issue:
When I activate slimbox, I expect the window to be darkened with a normally lighted picture showing next and prev tabs and a close button at the bottom. Instead I see the picture and window darkened, no navigation or close links. Clicking anywhere on the window removes the picture and lightens the window.
Fix:
Update jQuery or download the new slimbox2.js in the link provided.