I know, but mine doesn't work. I've already tried disabling the other plugins and I have enabled the lightbox effect in the general settings. I just don't get why it's not working.
Thanks for the tips on the child theme. I was new to wordpress and just started to try stuff out. But later realized that you need to update everything constantly and all your work will be erased. To late now maybe, but I will look in to it. Thanks anyways!