This problem was plaguing me as well, but in the time it took for my login to get approved, I got it resolved.
I noticed something in the sandbox "Test Email" logs; a warning that my email address (for my sandbox test account for the vendor) was not yet confirmed, and that payment would be sent when it was confirmed...
Our records indicate that this email address is unconfirmed. In order to receive your pending payment, you must first confirm your email address.
The "Email" gave me a link within sandbox to confirm the email address, which was useless (it seems a lot of sandbox fails! - Not Vodes' fault, but PayPal's).
So I figured it out...
In Sandbox, click on "Test Accounts", then click on "Enter Sandbox Test Site" and login using your vendor's credentials.
Then, go through the "normal" process of confirming an email address; click the word "Profile" and you'll see "Email".
Now, again, Sandbox fails the whole thing, but once you've sent the confirmation email, you'll find it back in your sandbox under "Test Email" (you won't actually get an email, but you'll find it there). The email is titled "Activate Your PayPal Account!"
If you copy and paste the link for the activation, it will likely fail (as it did for me), but if you go back to your Profile -> Email tab, you'll see that the account is indeed confirmed, and you can start receiving payment (and therefore, Vodes simply starts working).
Again, to clarify, the problem is with PayPal, NOT Vodes. So if you have this problem, go easy on the guy who put some
great work into this system.
Now that I've figured that out, I'm flying. My site is looking sick!
Cheers,
Robbie