a. Preferences window. Here it does nothing.
b. Quit to main menu pop up. Here instead of closing the popup it closes the game. I think enter should close the game and escape close the pop up.
c. In the scenario editor pressing escape launches game with the last opened save rather than returning to main menu.
2. Selecting Dynamic Stretch to window length brakes PBEM loading screen.
Dynamic Stretch ON
Dynamic Stretch OFF
I tested at 1920x1080 and 1024x768 windowed and not windowed and it made no difference.