problem after creating a blog with logged in user

Hej!

When creating a new blog with a signed in user, There is a problem with the output.

This happens always and just for logged in users.

Removing the "ob_end_clean" on the "signup_finished" filter makes the problem disappear.

Sounds like its the same problem as this ticket: https://premium.wpmudev.org/forums/topic/white-screen-after-creating-new-blog-when-user-logged-in

Please advise,
Thanks,

Koff