Dx12 mode makes editor crash

Hello,

I am working in a project and the editor crashes in Dx 12 mode. If I start with Dx 11 I can open the project and work on it, but if I start with Dx 12 it crashes just after opening the project.

The Log file says:

[2019.07.17-21.04.09:410][  0]LogD3D12RHI: Creating RTPSO with 30 shaders (0 cached, 30 new) took 149.78 ms. Compile time 135.15 ms, link time 14.56 ms.
[2019.07.17-21.04.09:435][  0]LogD3D12RHI: Display: Root signature created where the root parameters take up 13 DWORDS. Using more than 12 DWORDs can negatively impact performance depending on the hardware and root parameter usage.
[2019.07.17-21.04.09:479][  0]LogD3D12RHI: Display: Root signature created where the root parameters take up 15 DWORDS. Using more than 12 DWORDs can negatively impact performance depending on the hardware and root parameter usage.
[2019.07.17-21.04.09:654][  0]LogContentBrowser: Native class hierarchy updated for 'HierarchicalLODOutliner' in 0.0002 seconds. Added 0 classes and 0 folders.
[2019.07.17-21.04.09:654][  0]LogLoad: (Engine Initialization) Total time: 13.72 seconds
[2019.07.17-21.04.09:654][  0]LogLoad: (Engine Initialization) Total Blueprint compile time: 0.00 seconds
[2019.07.17-21.04.09:702][  0]LogAssetRegistry: Asset discovery search completed in 8.9193 seconds
[2019.07.17-21.04.09:704][  0]LogCollectionManager: Rebuilt the object cache for 0 collections in 0.000000 seconds (found 0 objects)
[2019.07.17-21.04.09:704][  0]LogCollectionManager: Fixed up redirectors for 0 collections in 0.000045 seconds (updated 0 objects)
[2019.07.17-21.04.09:705][  0]LogContentStreaming: Texture pool size now 3000 MB
[2019.07.17-21.04.09:723][  0]LogSlate: Took 0.000158 seconds to synchronously load lazily loaded font '../../../Engine/Content/Slate/Fonts/Roboto-Light.ttf' (167K)
[2019.07.17-21.04.09:798][  3]LogD3D12RHI: Display: Root signature created where the root parameters take up 13 DWORDS. Using more than 12 DWORDs can negatively impact performance depending on the hardware and root parameter usage.
[2019.07.17-21.04.12:368][ 84]LogThreadingWindows: Error: Runnable thread RHIThread crashed.
[2019.07.17-21.04.12:368][ 84]LogWindows: Error: === Critical error: ===
[2019.07.17-21.04.12:368][ 84]LogWindows: Error: 
[2019.07.17-21.04.12:368][ 84]LogWindows: Error: Fatal error!
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: 
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: 
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff9316903ea NahimicOSD.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff908fbfe1e UE4Editor-D3D12RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff908fbfa8a UE4Editor-D3D12RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff908fc2963 UE4Editor-D3D12RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff945bee8e0 UE4Editor-RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff945be1519 UE4Editor-RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff945befe50 UE4Editor-RHI.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff928b522d8 UE4Editor-Core.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff928b52563 UE4Editor-Core.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff945d4c111 UE4Editor-RenderCore.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff928f44b3f UE4Editor-Core.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff928f408a7 UE4Editor-Core.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff96d1c7974 KERNEL32.DLL!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: [Callstack] 0x00007ff96f2ba271 ntdll.dll!UnknownFunction []
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: 
[2019.07.17-21.04.12:369][ 84]LogWindows: Error: Crash in runnable thread RHIThread
[2019.07.17-21.04.12:378][ 84]LogExit: Executing StaticShutdownAfterError
[2019.07.17-21.04.12:378][ 84]LogWindows: FPlatformMisc::RequestExit(1)
[2019.07.17-21.04.12:383][ 84]Log file closed, 07/17/19 23:04:12

I have no idea about coding or what this all means, can someone please help me?
Thank you very much

In the callstack I see it is crashing inside of NahimicOSD.

Go into the Nahimic program and disable the on screen display feature or un-install Nahimic completely to see if that solves the issue.