@pavloborysenko
The site I am working on does not have a cache plugin installed, and I also have “allow multiple” set to “yes” and “currency storage” to “transient”. I even tried disabling all plugins except WooCommerce and WOOCS as well as switching to Twenty Seventeen theme, but to no avail. Can you please let me know if there is anything else that can be done? This is very frustrating both for me and my client, and a solution would be highly appreciated. For the record, I am using version 2.1.7 of WOOCS and the latest versions of both WP and Woo.
Cheers.