WinEEG 1.4 running on Windows 2000Pro on Dell 1.2 GHz Optiplex EEG screen scrolling at an indicated 30 mm/sec. Start making a recording and observe correct time stamp in top margin. Time increases as the scrolling action continues. Waveforms are presented in normal-looking manner. However, after 5 minutes pass on the clock on my wall (quartz), the time indicated on the EEG screen is approximately 3 minutes. I am running on 60 Hz, but I think that is not pertinent since the error is greater than 1.2 X . I am wondering if anyone else has doubts about the EEG time display ? I will check on a different machine to see if I can duplicate the problem in a different system. Dave Myer Boston Neurofeedback, PC