DCS 2.(whatever) works fine. Just 1.5.7 gets stuck at 57% on the loading screen until I kill it with the task manager. I uninstalled and reinstalled with same results.
It happened when I relaunched from 2D to VR. (I use 2D for the mission editor and re-check “VR” when I am done. That’s never been a problem before. I would like to try launching in 2D but don’t know how without the settings tab in the GUI.
I have not run into this. I use a shortcut with the --FORCE DISABLE VR flag (not sure if that is the correct format but I can check when I get home). Did you take a look in the DCS log file? (<SAVED_GAMES>/DCS/logs/dcs.log) or something similar?
=== Log opened UTC 2017-10-05 17:12:04
00000.000 INFO VFS: Using ‘Saved Games’: “C:\Users\Eric\Saved Games”
00000.102 INFO DCS: DCS/1.5.7.10175 (x86_64; Windows/10.0.15063)
00000.102 INFO DCS: CPU cores: 4, threads: 8, System RAM: 16309 MB
00000.108 INFO EDCORE: (dDispatcher)enterToState_:0
00000.111 INFO Dispatcher: 2017/10/5 13:12 V1704040900
00000.259 INFO INPUT: Device [Keyboard] created deviceId = 1
00000.260 INFO INPUT: Device [T-Rudder {F2F16220-F6C3-11e6-8001-444553540000}] created deviceId = 2
00000.260 INFO INPUT: Joystick created[T-Rudder {F2F16220-F6C3-11e6-8001-444553540000}], ForceFeedBack: no
00000.260 INFO INPUT: Device [CH Fighterstick USB {D5943490-DEDC-11e6-8003-444553540000}] created deviceId = 3
00000.260 INFO INPUT: Joystick created[CH Fighterstick USB {D5943490-DEDC-11e6-8003-444553540000}], ForceFeedBack: no
00000.284 INFO INPUT: Device [CH Pro Throttle USB {D5943490-DEDC-11e6-8004-444553540000}] created deviceId = 4
00000.284 INFO INPUT: Joystick created[CH Pro Throttle USB {D5943490-DEDC-11e6-8004-444553540000}], ForceFeedBack: no
00000.285 INFO INPUT: Device [Mouse] created deviceId = 5
00000.288 INFO INPUT: Device [TrackIR] created deviceId = 6
00000.373 INFO SOUND: loaded 1158 sdefs from “sounds\sdef”
00000.392 INFO SOUND: Using driver: xaudio29
00000.399 INFO SOUND: XAudio2: channel layout: Headphones/Stereo
00000.406 INFO SOUND: Found 3 available audio device(s):
00000.406 INFO SOUND: 0: ID: “\?\SWD#MMDEVAPI#{0.0.0.00000000}.{a586c3b9-f436-4249-ad9e-9ebfe2f057ca}#{e6327cad-dcec-4949-ae8a-991e976a79d2}”, Name: “Speakers (Realtek High Definition Audio)”
00000.406 INFO SOUND: 1: ID: “\?\SWD#MMDEVAPI#{0.0.0.00000000}.{977978b6-04e7-4d74-890c-e494b0a14d2c}#{e6327cad-dcec-4949-ae8a-991e976a79d2}”, Name: “Realtek Digital Output (Realtek High Definition Audio)”
00000.406 INFO SOUND: 2: ID: “\?\SWD#MMDEVAPI#{0.0.0.00000000}.{c676bfb9-4520-4155-9eda-df1aa8a06258}#{e6327cad-dcec-4949-ae8a-991e976a79d2}”, Name: “Headphones (Rift Audio)”
00000.406 INFO SOUND: Using SSE FTZ/DAZ mode.
00001.054 INFO Scripting: OBSOLETE mount_vfs_sound_path() used in ./CoreMods/aircraft/AJS37/entry.lua
00001.065 INFO Scripting: OBSOLETE mount_vfs_sound_path() used in ./CoreMods/aircraft/C-101/entry.lua
00001.078 INFO Scripting: PLUGINS START-------------------------------------------------
00001.085 INFO SOUND: loaded 9 sdefs from “.\coremods\aircraft\c-101\sounds\sdef”
00001.095 INFO SOUND: loaded 19 sdefs from “.\coremods\aircraft\m-2000c\sounds\sdef”
00001.097 INFO SOUND: loaded 10 sdefs from “.\coremods\aircraft\mig-21bis\sounds\sdef”
00001.104 INFO SOUND: loaded 8 sdefs from “.\coremods\aircraft\sa342\sounds\sdef”
00001.116 INFO Scripting: PLUGINS DONE--------------------------------------------------
00001.226 INFO Database: OBSOLETE mount_vfs_sound_path() used in ./CoreMods/aircraft/AJS37/entry.lua
00001.236 INFO Database: OBSOLETE mount_vfs_sound_path() used in ./CoreMods/aircraft/C-101/entry.lua
00001.249 INFO Database: PLUGINS START-------------------------------------------------
00001.256 INFO Database: PLUGINS DONE--------------------------------------------------
00001.345 INFO DX11BACKEND: Driver Concurrent Creates - 1
00001.345 INFO DX11BACKEND: Driver Command Lists - 1
00001.353 INFO DX11BACKEND: NVIDIA API init OK
00001.353 INFO DX11BACKEND: NVIDIA Display Driver Version 38205.r381_99
00001.353 INFO DX11BACKEND: TRUNK renderer init: showShaderError coreCount=1
00001.453 INFO DX11BACKEND: commonPool: 68-128, cbPool: 5-14, samplerPool: 5-16
00001.453 INFO RENDERER: Global metashader cache enabled
00001.453 INFO RENDERER: Loading metashader cache from C:\Users\Eric\Saved Games\DCS\metashaders/
00001.453 INFO RENDERER: Metashader cache: 0 (0) cached shaders out of date
00001.469 INFO DX11BACKEND: DX11ShaderBinaries::loadCache Bazar/shaders/fxo : 1526
00002.393 INFO DX11BACKEND: DX11ShaderBinaries::loadCache done
00002.393 INFO DX11BACKEND: DX11ShaderBinaries::loadCache C:\Users\Eric\Saved Games\DCS\fxo : 34
00002.405 INFO DX11BACKEND: DX11ShaderBinaries::loadCache done
00002.421 INFO EDTERRAINGRAPHICS3: edtg::CreateSurfaceRenderItem()
00002.840 ERROR_ONCE DX11BACKEND: rendertarget ‘rtDynamicCloudMap’ not found
00002.841 INFO EDTERRAINGRAPHICS3: edtg::CreateSurfaceRenderItem()
00002.848 ERROR_ONCE DX11BACKEND: texture ‘raindropNormBlur3.dds’ not found
00002.858 INFO DCS: gDescription: “NVIDIA GeForce GTX 1080” gVendorId: 4318 gDeviceId: 7040 gMemory: 8110 MB
00002.866 ERROR EDOBJECTS: Destruction shape not found AVIASHTAB_CRASH
00003.104 INFO wInfo: multiple adapters
00003.184 WARNING LOG: 1 duplicate message(s) skipped.
00003.184 INFO TERRAIN: lSystem::lSystem
00003.199 INFO EDCORE: (dDispatcher)enterToState_:1
Figured it out. Thanks. Just deleted the DCS folder. (Nuclear Option)
Good that it is working 
the game folder or saved games folder?
Saved games. Not DCS alpha. Nor DCS beta. The new 3rd DCS that’s been added to lessen confusion.
Happened again. And again at 57%. I’ve loaded several times today with no issues. I have made no changes. I didn’t even look at any files within any DCS folders. All I did on the session before the stuck screen was record and review a track.
[Edit] Solved again…
This time instead of deleting the entire saved games/DCS/ folder I deleted only the Mission Editor folder and restarted successfully.
Here’s the log entry that made me do this after the failed start…
00040.834 ALERT Dispatcher: Error starting Mission editor: [string “./MissionEditor/modules/me_aircraft.lua”]:183: attempt to index field ‘?’ (a nil value)
Odd. That is not something that should change unless it has to do with a patch. Lua suddenly being unable to parse that file after a number of times of having no issue seems odd. Not having any other hard drive issues?
I will take a look at that file when I get home tomorrow.
Mods can cause the above error
No mods except various planes. The F-5 being the most recent.