I am using OpenID delegation, set up on my homepage to delegate to stackexchange. Previously I used MyOpenID as the backend, but as it will be closed down in February I have switched to SE as the backend.
However on magiclantern.fm the delegated ID does not work, as I'm getting the following error:
Detected an attempt to send an assertion when the identifier (http://sztupy.hu/) is not owned by the logged in user.
If I switch back to MyOpenID backend everything works fine, and I can log in, but that won't be an option after February.
Note: I know about this question, but that's not about delegation, and doesn't have any answers.