Hello there @ch00path1ng4!
Checking through the community, a few start up issues have appeared in relation with 5.6. Particularly, the error you are getting is tied to GPU issues, either software or hardware:
D3DCommandQueue->GetClockCalibration(…) failed with error E_FAIL
Let’s cover a few methods for resolution:
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Refresh your nVIDIA drivers. Pick the “Clean Installation” option, as well as going for the “Developer” drivers, as these have more stable settings for engine work
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Test switching between DX11 and DX12
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Go to Windows Graphic Settngs, and set UE to High Performance
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Since you recently updated to UE 5.6, try deleting all files from directory C:\Users\UserName\AppData\Local\UnrealEngine (make a backup just in case)
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Access regedit, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers, and add a TdrDelay at value 60 (this will prevent the engine from “losing” your GPU)
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Ensure your GPU is properly mounted, and no connection is lost with your motherboard