Community AdminJust as an idle thought, can you disable any overlay software that you have, in case it's a factor?
I have tried with Origin both enabled and disabled, as well as completely exiting Steam and UPlay, without success. To be clear, I have the same issue as the original poster where the screen will flicker back and forth a few times, but too fast to discern whether it actually goes fullscreen and abandons it, or if it's just a black screen inbetween windowed mode.
I have also tried forcing Windows' resolution to 1280x720 and other reasonable resolutions (my native resolution is 1920x1080 which I would prefer to play at) and matching that resolution in-game. No cookies.
Additionally, I have tried a lower fullscreen resolution in-game (say, 1280x720) with Windows set to 1920x1080, which oddly enough results in a fullscreen window with borders at 1920x1080 unscaled, regardless of which resolution is picked in-game. It is 1920x1080 for certain, not simply upscaled, although if it were I would consider that behavior odd as well.
Are there any command-line switches such as the ones which enable 60FPS cutscenes, but to force resolution and window mode?
