dickey1 on "[Plugin: Jigoshop] Using WP Super Cache"

Problem solved!
Apparently the settings in WP Super Cache have to be modified for my website so additional e-commerce pages (store, product) are excluded from the cache in order for the site to work properly. I excluded "store" and "product" pages using the advanced settings on WP Super Cache and now the "empty cart" and "update cart" buttons function properly.