To communicate with your new ASPSQLProvider usernames, try switching
your SharedServices application to forms  authentication as well.
this will require you to put the connection strings and membership
provider information in the web.config file for the Shared Services
app in the same way you did for your main application.

this will allow your shared services (which hosts your profiles,
audiences, etc) to recognize the SqlMembership provider, along with
any users  you already have going.

I added connectionstrings in web.config, and even configured default
zone on the SSP web application to ASPNETSQLPROVIDER. I changed site
collection administrators for SSP web application. No luck yet. I get
Access Denied, when I go to certain pages within SSP management
(_layouts).Irrespective of SSP web application configuration, the
User Profiles can either read from AD, LDAP, or BDC.
Any further configuration  that I may be missing? Or do we know that
User Profiles, MySites for FBA works?