The entire UI becomes not clickable, when the lightbox tab is open in the plugin settings.
This is caused, if the Shield plugin (https://de.wordpress.org/plugins/wp-simple-firewall/) is installed at the same time. It overrides the <li class=”featherlight”> with some other CSS, which causes the li to overlay the entire screen. If the following admin style is added, it works fine again:
.subsubsub li {
position: relative;
}
I know the problem actually lies with the Shield plugin, but maybe you can also fix this on your side.
Best
Markus