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Are your desktops logging straight in without a pause?? If so one possibility that can cause this is that the computers are not logging on to the domain initially and are using the cached credentials all the time. On one of your desktops. On one PC go into the local group policy editor and set the number of logons to cache to 0 in . . .
Computer Configuration, Windows Setting, Local Policy, Security Options "Interactive Logon: Number of previous logons to cache

reboot and log on (there should be a slight delay if it's worked, if not check your cached log ins is still set to 0 and reboot again) see if it still does it on that PC. . .