Forum Embedding appears to have a recently introduced bug that I've just discovered.
To see the problem, visit an embedded forum with "Redirect to..." set on it.
Then go to a user profile screen and attempt to send the user an email. If I "wheel-click" or choose "Open link in new tab" in my browser the email screen opens in a non-embedded Nabble window.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.