Failed to create D3D9 Device!

Question

I was playing A Hat in Time, and suddenly the game crashed. When trying to load the game up again I get the following message:

Failed to create the D3D9 Device! This can happen if the desktop is locked. Exiting...

I have ran dxdiag which says everything is hunky-dory.

user136727 · Answer

You can try the standard fixes:

Reboot your computer.
Verify Integrity of Game Files.
Update your drivers.

People have reported the following fix the issues.

Setting Game Launch Options to -dx9.
Browse Local Files.
Right click A Hat in Time; press Properties...; select Local Files tab; select Browse Local Files...
This will open an explorer window to steamappscommonHatinTime.
From here navigate to HatinTimeGameConfig and open HatinTimeSystemSettings.ini

Edit game config.
steamappscommonHatinTimeHatinTimeGameConfigHatinTimeSystemSettings.ini

From here there are two reported fixes:

Edit ResX and ResY to smaller values.

ResX=1600
ResY=900

Set Fullscreen to false.

Fullscreen=False

For me setting fullscreen to false worked.
The game set my vertical monitor as the default, and then positioned the game on a different monitor.

Failed to create D3D9 Device!

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