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This is an ongoing post on trouble shooting WP e-Commerce.  You’ll find solutions here to problems you’re encountering.

404 Errors in WP e-Commerce with WordPress Version 2.6

WordPress created a new problem for WP e-Commerce when it introduced revisions in the release of WP 2.6.  After this users started finding that they would get seemingly random 404 errors.  The first thing you need to do is get the plugin Remove Revisions, install it and activate it.  Here are the steps to take after you’ve done that.
1) In the admin panel click Manage.
2) Click Remove Revisions in the secondary panel
3) Click the remove revisions button in the panel
4) With the upper Menu still set to Manage click pages
5) Click catalog
6) Click HTML and copy what is there.
7) Delete the page
Click Write
9) Create a new page
10) Title it Catalog
11) Publish it
12) Click e-Commerce
13) Click Settings
14) Click Admiin
15) Go to bottom and click Update Page URLs
16) Check that the front side is working fine again

PayPal Unable to Process Payment Error

Using PayPal with WP-Ecommerce you’ll often find that on your first test trial (you should always test) you’ll get an error saying: “Return to Merchant. Unable to process payment. Please contact the merchant as the shipping address provided by the merchant is invalid, and the merchant has requested that your order must be shipped to that address.”

To fix this go to merchants/paypal_multiple.php

Find this line:
$data['address_override'] = ‘1′;
(should be line #46)
and delete it or comment it out.

Anyone know how to clear up this warning?  Please leave a comment answer.

Warning: Invalid argument supplied for foreach() in /home/shopgree/public_html/wp-content/plugins/wp-shopping-cart/merchants/paypal_multiple.php on line 82

Warning: Cannot modify header information - headers already sent by (output started at /home/shopgree/public_html/wp-content/plugins/wp-shopping-cart/merchants/paypal_multiple.php:82) in /home/shopgree/public_html/wp-content/plugins/wp-shopping-cart/merchants/paypal_multiple.php on line 237

Adhamox answers this below in comments.