If you use "Microsoft Active Directory" for authentication, see that
IMPORTANT NOTE – READ PRIOR TO INSTALLATION:
Important note when integrating Oracle BI 126.96.36.199.x with Microsoft Active Directory and when configuring multiple Identity Stores
Impacted Releases: 188.8.131.52
When using Microsoft Active Directory as the Identity Store and also using the virtualize=true option as described in the BI Security documentation, the patch for Bug 20188679 must be downloaded and applied. Otherwise some or all users may be unable to login to Oracle Business Intelligence.
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It looks like there are 2 bugs around the authentication providers (I guess you also have the internal weblogic LDAP one setup for system accounts).
The one Felipe posted about and a second one which you can read about here: Re: Unable to login after LDAP setup on 184.108.40.206
This second patch isn't public actually and must request access to it via a SR.
So read that thread and see if it match your case and maybe you also need that second patch.