Start with the simplest thing first: disable your CDN and clear your browser’s cache and cookies. Then re-visit your site where the image has a problem.
Does the image load after that?
]]>For anyone else out there, Autoptimise plugin (or my use of it) seems to be the culprit.
Specifically, when I remove my CDN Base URL reference (https://[mysite].com.au/) from the CDN options frame, the Lightboxes revert back to normal, everything else unchanged.
It does negatively impact the Yslow score though, by about 12%, so I do need to figure out how to get everything working properly in concert.
Anyway, Ligntbox solved for now. On to the next problem …
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