I've just upgraded to 5.0 official, and all SmartDashboard seems to be working correctly.
I'm running Mandriva 2006 with a kernel.org 2.6.13.4 kernel.
My smartclient install is NG-R55 Hotfix 0.010 - build 1.
There are still issues with SmartTracker not displaying the query frame, nor the log details.
SmartUpdate cannot run initially because the SmartUpdate ActiveX is not correctly registering.
I have not yet tried the other Clients, since they are not appropriate for my install.