Can't login as super admin after installing Branding.

After I installed Ultimate Branding, I can’t log in as superadmin and see the Branding menu. It logs me in as a user on the parent site of the network only, with no access to the additional sites, and no super admin privileges.

Any Ideas why? I suspect UB plugin. If I just delete the plugin from Filezilla or cpanel, will this break anything?