I use WP 3.5.1, and E-Commerce 220.127.116.11. I faced an issue after checkout: "Not Found
Apologies, but the page you requested could not be found. Perhaps searching will help."
URL looks like: http://www.melok.kiev.ua/?page_id=348&sessionid=1981366231079.
User gets order confirmation email about purchasing. But session\cookie are not cleaned, so when user opens shop again he sees his order and purchases again.
I tried rename shortcuts as they were in Cyrillic. But it didn't help.
Also I used to Minimum Purchase for WP E-Commerce plugin, now I uninstalled it.
If you go to site you can find "Shop" menu under name "Магазин" )
Thank you in advance.