After server migration the images in posts aren't downloadable anymore

I took a look at @Bryanpwo’s forum and couldn’t see any obvious reason for which the Lightbox wouldn’t work.

The issue is acknowledged though:

Several users were able to fix this issue, but it seems there is an array of possible causes.

I couldn’t do more than suggest a restore on a fresh, standard install without any custom settings, plugins, themes, or theme components.