I’ve had the same issue since version 6.3.4 and solved it through MaxGalleria settings.
Up to version 6.3.3 the value for “Thumbnail click opens” in both the default options settings for MaxGalleria and in each defined gallery’s options settings could be set to “Lightbox image” and site visitors clicking a thumbnail in a gallery would have the lightbox experience (nice overlay, greyed-out beneath, navigation buttons).
After 6.3.3 a value of “Lightbox image” for “Thumbnail click opens” gives the experience as described above – a picture, no lightbox and no navigation buttons with the escape being either a page refresh or using the browser ‘back’ button.
Setting the gallery’s option “Thumbnail click opens” to “Open link in lightbox” restores the desired lightbox experience (nice overlay, greyed-out beneath, navigation buttons). Setting the same value in MaxGalleria’s default options makes no difference whatsoever – you need to change the setting in each gallery’s options to affect behaviour.
