On the Fundraiser settings page I enter a PayPal approved email, then click save. It returns with a one (1) in the email address field and of course when I try it with a Fundraiser it sends a 1 to paypal. Same result in Sandbox mode and live. I do have a sandbox account. I've tested the Advanced Crowdfunding in the sandbox using the same PayPal ID and it works. I have tried setting it to a couple of different business PayPal IDs with the same result.
Any help would be greatly appreciated.