Roaming profiles on mac network

We have a mac network in our office connecting to an xserve. our users use roaming profiles but something very strange has all of a sudden happened to one of the macs

one of our users, when he logs on to the mac he just gets the desktop wallpaper but doesnt get any icons or menus. i have left it loading for an hour and nothing ever changes. he is the only person that has this issue and it is only on this one mac that it happens. he is able to log onto any other mac.

has anyone seen this or got any advice?

It happens all the time in the Windows world. Sounds like profile corruption. Backup the local profile then delete it.