Hi @shingen,
if the solution to disable cascade layers work, then it’s the issue that @macksix is linking. Actually, the root cause is this one: WIP: Broken image lightbox WooCommerce - #4 by timmse, which we will update after the issue is solved.
To prevent having duplicated reports, I’ll close this topic and mark it as duplicate.
Yes, we do have a local development installation, and we replicate every issue locally first, and only then do we record it to our local bug tracker, because we need reproducible steps. But to replicate it, we need further information, and the link to the website will most of the time vastly help us.
Best regards,
Matej