We are having an issue with about 20% of agent installs. The intial problem appear to be locked/corrupt profiles, which we narrowed down to a locked NTUSER.dat. If we removed these in safe mode or removed LANDesk the issue went away and the user could log in correctly. We have finally narrowed this down to a problem with HKEY_LOCAL_MACHINE\SOFTWARE\LANDesk\Inventory\LogonHistory\Logons and if we delete the entries in here it sorts it out once and for all and allows the user to login with no problem.
Has anybody else come across this?