Hello,
Thanks for the reply.
“(The products quick view or preview popup is blocked, i.e. the popup will open but it doesn’t work, the image stays loading and the links don’t work.)” – please try to disable all the third-party plugins (including cache plugins), that does not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear the cache of the browser, and check then. Maybe one of the additional plugins is the reason for the problem.
Regards