Do you have any add-ons in your Community folder? If yes, please remove and retest before posting.
No - has been removed
Are you using Developer Mode or made changes in it?
I don’t beleive the last time I ran the sim I had Dev mode on
Brief description of the issue:
Start the game either through a desktop shortcut or through steam, computer thinks about it for a while, then nothing ever happens. Steam initially says the game is running, but then it revert back with the window never appearing
Provide Screenshot(s)/video(s) of the issue encountered:
N/A
Detail steps to reproduce the issue encountered:
Just try to start the game any which way
PC specs for those who want to assist (if not entered in your profile)
AMD 5900x, RTX 3090, 64GB RAM, 2Tb M.2 storage
Build Version # when you first started experiencing this issue:
Steam had updated to the latest sim update 5, cannot run the sim to see specific build
Are you on the Steam or Microsoft Store version?
Steam
Did you submit this to Zendesk? If so, what is your ticket #?
Yes - 111836
Anyone else experiencing this? The only other detail I can get is that the Windows Event Viewer does show an error for every attempt to run the game:
Faulting application name: FlightSimulator.exe, version: 1.18.13.0, time stamp: 0x00000000
Faulting module name: WwiseLibPCx64P.dll, version: 0.0.0.0, time stamp: 0x60532b0b
Exception code: 0xc0000005
Fault offset: 0x00000000001a279f
Faulting process id: 0x39e8
Faulting application start time: 0x01d7830b8e8cc507
Faulting application path: C:\Program Files (x86)\Steam\steamapps\common\MicrosoftFlightSimulator\FlightSimulator.exe
Faulting module path: C:\Program Files (x86)\Steam\steamapps\common\MicrosoftFlightSimulator\WwiseLibPCx64P.dll
Report Id: cac761b8-4c5d-4050-b203-03f36f291121
Faulting package full name:
Faulting package-relative application ID:
… which seems to imply a memory access violation 
Game was running fine yesterday and even this morning, this seems to have occurred immediately after steam installed the new sim update 5, I literally can’t run the game at all.
Any help thoroughly appreciated!