Emails sent to me for new user have empty Activation Key.


I have a "vanilla" site with only some of your plugins. I have activated:
Select Language At Signup,
Set Password on Multisite Blog Creation,
Remove Email Verification,
and Signup TOS.

When a new user sings up I receive an email with an empty Activation Key like:

The user "david" has submitted a manual payment request via the Pro Sites checkout form.

Level: 2 - Next
Period: Every 12 Months
User Email: david@
Activation Key:
Activation Link:
Site Address:
Manage Site:
Coupon Used:
Payment Amount: 100

Any clue?