Blank all popup windows

[borick]

I have a menu item with link to content page in my site. Settings of menu item: Popup window - Lightbox.
And it worked.
Now doesn't work any popup window in my site: neither this menu item no any popup map window (in IOSR). All popups is blank.
Please help.

[webgift]

Hello,
It may happen as the inner.php file is blocked due to firewall settings or a PHP fatal error is
generated for some reason. 
In any case we have to check this out thoroughly.
If you are interested please send me a PM with your back-end details.