After updating to the latest version (1.15.2), all lightboxes on my site dissapearing whenever trying to make use of the buttons in the modal.
Please write a link to any page where you use lightbox.
I have send you a link via email where the issue occurs
If further info is needed, please let me know.
Never mind, issue is solved. I discovered there was some conflicting css for the "X" button used for another plugin and was causing the 3D Flipbook modal to close.