LogonAdmin.jsp allows the user to select the BSV (Domain) to login to.
Logon.jsp logs into a default BSV (aka Domain), which suggests that you have not included the BSV in the login url ("domain parameter is not specified")
Reading the additions to the help page for the new JSPs they seem a bit confusing as it states that logon.jsp connects to the default BSV and not a parameterised domain. Try adding
?domain=nameofdomain
Where nameofdomain is the name of a BSV on your server.