Fabric Manager account issues

[Tony Deneka]

I'm running Fabric Manager 5.0.0a and am manageing a group of Brocade 3800, 3900 swithces and Brocade MPRs. I am trying to define user accounts to track individual users for compliance reasons. I've defined users on each of the switches and MPRs. When trying to set the fabric logon credentials for the MPRs Fabric Manager will accept nothing but "admin" as the user name. All attempts to use an account other than admin result in Authorization Failed messages. This applies whether I attempt to log on to a single MPR or all of them at once. Each time the test is run, all of the logons for the switches run fine with the user defined except for the MPRs. The account is valid and tested with PuTTy and with the WWW switch manager interface. And using the same methods in Fabric Manager against the 38/3900s work fine.
Is this some kind of known limitation with FM and MPRs? If so, is it documented somewhere?