Roaming Profile Download problem

We have WindowsXP clients with NetWare v6.0 servers and ZEN for Desktops v3.2 SP2. We use Roaming Profiles to keep the user’s desktop consistent from day to day and machine to machine. The problem that we have is that the Roaming Profile does not always download. If the XP workstation has any issue downloading, it prompts the user to either use the Local profile or download from the network. The problem is that Use Local is the default and the dialog has a 30 second timer before the default is chosen. Q177147 talkes about a Registry Key to make the default Download for Win2000, but it does not seem to work consistently on WinXP.