You don't need to do anything with Zen Cart for SEO EXCEPT simple meta tags and a good product description. The search engines will handle the links just fine.

In fact Google would prefer you not SEO and yours is one of the reasons stevesh and I do NOT recommend using any SEO. It, more often than not, just leads to link problems on the site and for the legitimate search engines.

And I would rethink Wordpress if you can. They are not quite up to date with their security fixes and have been known to be the portal for hackers to gain access to your site.

BOTTOM LINE

Try removing all instances of any SEO program and see if the links for the easy pages don't recover. If you have used any TinyURLs in the EzPages, I'd take them out as well for now.