I also have the same problem & still not figure out why this problem occur. It seems that this problem cause by wordpress pagination and WP E-commerce pagination conflict.
There is one thing that you can do to fix this (for a while) before GetShopped.org developer fix this problem ( I hope they will )
On Admin Panel, Go to Setting —> Store —> Presentation tab —-> scroll down to Pagination Setting and set Use Pagination radio button to “no”
It will turn off WP e-commerce pagination, so when you go on the blog Category and you click on the pagination link, it will not reach a page which lists some products of the WP e commerce plugin.
The bad thing is, if your web visitor go to your shopping page, it will display entire products with no pagination because you turn off the pagination setting. But I think it’s better than having “broken link” in your website.
I hope it help ??
