I can't turn off easy blogging on the main site

Hi, on the main site of my network, I cant turn off easy mode.
My admin always show me easy blogging interface, i have to always exit easy mode when i open an admin page.
I have this problem since the 3.0.1. This problem affect only sup admin, not admin of network sites.
I have set the option "Force \"Easy\" mode for user with this role and below" to contributor and all over levels but it doesn't change anything.