Congrats on the release of the Player Edition!
Manage >
Realm >
Invitations >
Create Invitation, and filling in the form to send an invite generated an error on my end:
Using RW 1.0.1023.183
Title bar of RW indicates I'm logged in, and sender address is same as my login.
Edit: Might I assume this is because of what the invite dialog suggests, that the invitee must first have a RW account with LW?