I'm not sure if this is related to the client or a general Windows problem but I saw nothing relevant from Microsoft.

For one user when he hits Ctrl-Alt-Del he gets the Novell menu properly, but when he clicks on Task List a Windows Task Manager window opens with no controls and no content. Once that Window is open there is no way to close it short of logging out.

Windows XP SP2, fully patched, Novell Client 4.91 SP3, ThinkPad X61s.

-- David