Hey there. I am currently trying to set up paypal express to work with a site. I have read other post about the Ceon URI mapping module interfering with this process. However I have turned off, uninstalled, and even reinstalled the module and the only difference is, with it turned off or uninstalled, when I clicked checkout I am redirected to the home page instead of the 404 error page. Paypal standard works ok, some orders are not processed through zencart and do not show up under the admin panel / customers account. This is why they are trying to switch to paypal express. The site only has two addons a custom template and the Ceon URI mapping. The debug logs show no problems.

Thank you,
Chris