Flickering is caused by other programs running in the background, so really nothing to fix on this end. However all games starting with Diplomacy use a new 3D engine, and so far I have not seen any reports of flickering on anyones system.
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Showing developer posts only. Show all posts in this thread.
Talk to the programers of the program that is interfering with HOI2. 
HOI 2 is not effecting them they are effecting HOI2.
HOI 2 is not effecting them they are effecting HOI2.