On all the machines I tested the old base code on, the graphics would flicker after switching from "fullscreen" to "windowed" mode. The display would behave as if the V-SYNC was still locked on the fullscreen window. The new base code fixed this problem, but the part of the code that actually fixed it has been elusive. Does anyone know what what part of the code fixed it? Thanx in advance

Sorry, the above mentioned base code referred to (NeHe) Jeff''s on-line tutorials.

It was in the way the display mode was restored. Check out the section where the display mode is set back to it''s previous setting. I think there were some comments there about the flicker problem.