Problem: Can’t edit or upload images in the Product Images section of a WP e-Commerce product.

Solution: Deactivated the “Berita” WordPress theme I was using and activated the “Twenty Ten” default WordPress theme. Worked great. Apparently there’s a javascript conflict caused by the Berita theme. Before deactivating the offending theme I deactivated all of the plugins.

Installation:
WordPress 3.0.1
WP e-Commerce 3.7.6.7
Offending theme: Berita Business 2.3.3 by BizzThemes