Right now you “lbpModal” as secondary class. If you change to “lbp_secondary” in “other” tab it work? Does for me with your HTML, I copy and pasted. “cboxModal” does not work though. You can name that secondary class anything you like.
After another test I think cboxModal works as well, heh. Went a bit too fast… I think you have setting problem.
My classes for Flickr popup, now testing lbpModal class:
<a class="lbpModal cboxElement"
yours
<a class="lbpModal"
Somethign is missing. But I dont have 4 Lightboxes active ?? Does seem like you only have 1 Colorbox so that is something. No JS errors either but still.
Notice rel="wp-video-lightbox"
for Youtube popup. Is that from this plugin or WP-Video-Lightbox?
May be you can test with same theme but less similar plugins?
I wont bet on it but you dont really use Lightbox Plus for the video
? Is PrettyPhoto but then why cboxElement class? Conflict? May be you have to turn off all automatic injection of classes to make so many plugins work together, on same page at least.
<a title="" href="https://www.youtube.com/watch?v=GoHwSPrkAa4?width=853&height=480" rel="wp-video-lightbox" class="cboxElement"><img alt="" class="video_lightbox_anchor_image" src="https://www.interpretationshop.co.uk/wp-content/uploads/2012/07/video.jpg" style="opacity: 1;">
</a>
<a href="https://imapflickr.com/9df9b9" class="lbpModal"><img src="https://www.interpretationshop.co.uk/wp-content/uploads/2012/07/product-map.png" alt="" class="alignnone">
</a>
Other Lightboxes I can see are:
Fancybox from Woo
PrettyPhoto from Theme
PrettyPhoto no. 2 from wp-video-lightbox
Thickbox is also there ??
https://imm.io/Viv4 There are your 2 buttons, and a gallery in background. All works. Map is in secondary thingy.