I'm having an issue at kallistipress.com, where I've installed drupal and the ecommerce modules suite, but when users try to download files that they've purchased, they get an Access Denied error.
I have store, cart, product, file, tangible, and parcel enabled. (Plus coupon, payment, paypal, shipping, and shipcalc, but I doubt those are involved.)
Since shipcalc isn't completed, I'm hand-enterring transactions via the transactions administration page.