We have 3 x 2003 servers located in different locations using DFS. At one location inparticular, random XP clients seem to choose the incorrect DFS drive on startup.
If I manually try and change it on the client (ie go to properties of the share, DFS, and set active) - I get an error 'parameter is incorrect'. Sometimes restarting fixes this (temporarily), sometimes it doesnt.
it obviously slows users down a lot when this happens! let me know if more info is required