Product's link in Shopping Cart with Attributes doesn't redirect back to product

I just upgraded to Zen Car 1.5.1 from 1.5.0. I'm going through to make sure everything is still working and noticed that the items that are held in the shopping cart have a link, but it is a broken link. I only have the problem with items that have attributes. I am using the Plugin Ultimate SEO URLs, so the broken link just goes to "/product_info." Any ideas what is going wrong.

Try disabling the url rewriter and see if it is still broken

Thanks didn't try that.....When disabled it, I worked correctly. I will have to reinstall Ultimate SEO.

Aye, some of the versions had problems with handling uprid's generated for attribute pages. There is a workaround posted for versions between 2.200 and 2.209. The current version includes a number of fixes, enhancements, and performance improvements.