Sorry, but my thread seems to be closed
So I canot answer there.

I disabeled all add-ons and WD plugins except for app+ and WPMU DEV. Nogo. Restarted twice. nogo. there is access for support now. cannot add service provider from user list. No new entry pops up on clicking the add new button.
Had a similar problm earlier. Thought it was due to special characters. Now im not sure.