If you are launching the title from the unified Serious Sam Fusion 2017 module, your active profile settings path is located here: C:\Program Files (x86)\Steam\userdata\[YourSteamID]\564310\local\
The most common cause is outdated software that can't handle the game's rendering requirements.
Modern gaming monitors often run at 144Hz, 165Hz, or 240Hz. Serious Sam 3 never tested these refresh rates. Sometimes, the game requests a mode that combines 4K resolution with a high refresh rate, and the video driver refuses. serious sam 3 cannot set display mode
This is the first and most effective step for 80% of users. The game’s configuration file often gets corrupted or stores an invalid display mode from a previous launch.
If your monitor runs at 144Hz or 75Hz, but the game defaults to 60Hz, the error appears. If you are launching the title from the
Complete the wizard installation, restart your PC, and launch Serious Sam 3. Force Direct3D 11 via Launch Options
You can also try adding -safe to launch with minimal video settings. 4. Graphics Driver and DPI Settings Sometimes, the game requests a mode that combines
: Forcing the game to switch between DirectX 9, DirectX 11, or Vulkan without the right software runtimes installed causes an instant crash. Core Solutions to Fix the Crash
You can bypass initial configuration errors by forcing resolution through the Steam Launcher .