There are two "workarounds"
The first one is to rename the WH40K executable to something else (like ChaosGate.exe), but for me cause a lot of stuttering.
The second one is disabling Directdraw setting (UseDirDraw = False) in the Chaos Gate registry folder, game will run fine, but the various menu will be displayed in a weird way (screen will be black, you have to move/click the mouse for displaying the menu entries, in some case like in the squad/ equipment menu you have just to clik on a space marine portrait to show the whole screen)
If you want to disable DirectDraw also make sure to set the resolution to 1024*x768 (by editing the two DisplayResolution in the chaos gate registry folder)
Post edited August 30, 2015 by drk84x