Thanks Jazzworm,
After i set the option Image Browser, i found out too it didnt work quite as good as i thought.
Ive unchecked the Image Browser and changed the effect from ‘shutter’ to ‘lightbox’ and it works perfectly.
I think ive found the solution or at least a workaround.
Go to the “Options” page of the gallery, then go to the “gallery” tab.
Check the option “Show Imagebrowser”.
This should fix it.
Same problem here, only have the nextgen plugin installed and activated, nothing else.