While presenting with PPT (2003) in slideshow format through LCD projectors, my desktop taskbar will randomly flash at the bottom of the slide (even when taskbar is in autohide). Using T410 with Win 7. Am aware that older LCD projectors change the desktop screen resolution settings, but have no explanation for random flashing. Appreciate help on this. Would also appreciate knowing if the desktop screen resolution changes are normal, as it never occured on my T42 using XP.