WP e-Commerce Sub-categories no longer showing up after upgrade

I recently upgraded my WP e-Commerce plugin to 3.6.10 and now while my clients’ main store does show up (https://www.clocksforcritters.com/store/) going to a subcategory (https://www.clocksforcritters.com/critters/) brings up a 404 Not Found error page. What do I need to do to make my sub-categories re-appear.

Sorry for posting it here but the Instinct Forums for the plugin are currently down.