1) verify integrity of your game files through steam
2) check if you have a DirectX 10 card or not
3) check if you have 'gpu accelerated launcher' enabled in the options or not
4) please include the name and native resolution of your monitor
Go to C:\Users\QUF\Documents\Assetto Corsa\cfg and open video file, there you can manually edit WIDTH= and HEIGHT=.
If doesn't work, go to Troubleshooting section of the official forums and "Need support? Zip and attach your logs ("Documents/Assetto Corsa/logs" folder) in your post", also list your pc specs, which monitors, and how you connect them.
this happens to me all the time. I have to go to steam, exit out of steam and start the game without steam. This automatically starts steam again and then everything is fine. This happens pretty much everytime I start the game for the first time. I would love to find what is causing this
Are you using any kind of monitoring tool for fan profiles or over clocking? Apps like MSI Afterburner?
They have prevented me from playing since version RC1 came out. As soon as I stopped using a monitoring tool, the game ran p perfectly