AspNetSqlProvider vs AspNetWindowsTokenRoleProvider conflict


I have installed the FBA tool but have a problem with Sharepoint Central Adminstration. If I set the rolemanager default provider to AspNetSqlProvider in web.config I can view the manage FBA user and FBA roles pages but I clicking the Operations and Application Management tabs displays w windows login dialog which does accept my windows credentials and gives an error page. If I change the default provider to AspNetWindowsTokenRoleProvider then I can view the Operations and Application Mangament areas but can't display the FBA roles page ( which tells me I need AspNetSqlProvider).
Anothe question while I am here: how do I assign permissions to the roles?
Thanks for your help..in anticipation.