We are currently using Zen

Basically we have student machines and staff machines and Zen runs on both. On staff machines, Zen works fine but student machines experience a strange intermittent problem which we can't pin down to users or machines as it'll effect a user one day and not the next.

It seems that Naldesk doesn't always load, you get the icon in the system tray for a split second and then it disappears again, sometimes you can restart it by running naldesk from the command line / run command but sometimes even that doesn't work.

We've nothing out of the ordinary running on the student machines that doesn't run on the staff machines. Has anyone else experienced this and what solutions have you found?

Thanks for any info,