i’ve installed windows 8.1 some days ago, and after that the rendering dx9 dosen’t go fullscreen. i’ve experienced some similar problems in multimonitor setups, caused probably by nvidia optimus system. I know that win8.1 has something new about multimonitoring support, so i think should be something related. but i’ve experienced the problem with only 1 monitor (the laptop default one).
dx11 render works fine.
i’ve tried to update the video drivers to the last version for win8.1, and also updated the dx9. but nothing to do. any advise? has someone the same problem?