Instinct eCommerce plugin: having difficulty with Paypal, need help…

Heya,
So I’m integrating the latest version of the WordPress eCommerce plugin by Instinct and I’m at the point where I’m enabling Paypal and Google Checkout but I’m having some difficulty.
I began by enabling Paypal Express, entering the appropriate credentials it request and updating. Then I enabled Paypal Express from the clients Paypal account. Then I ran a test transaction, but instead of redirecting the user to a Paypal page it just leads them directly to the “Transaction Results” page.
So I attempted to setup Paypal Standard, so I disabled Paypal Express and selected Paypal Standard, entered the appropriate credentials and ran a test transaction. But still the user gets forwarded directly to the “Transaction Results” page again.

Can anyone give me some insight as to what I’m doing wrong here? Thank you!