Hey y'all,   
After updating today DCS began to experience an error upon start up in which it would log in and then promptly shut down without any error or notification. The only way I knew this was occurring was my track IR light going out and the game being absent in task manager. I reverted to 2.5.3 and it resolved the issue immediately. Prior to reverting I repaired the game/checked file integrity successfully twice. Currently have the Viggen, Hornet, Harrier, FW190, P51, Gazelle, C-101, FC3, A10 installed right now. Here is the log-   
=== Log opened UTC 2018-12-20 16:33:05 
2018-12-20 16:33:05.538 INFO    DCS: Command line: "C:\Program Files\Eagle Dynamics\DCS World OpenBeta\bin/DCS.exe" 
2018-12-20 16:33:05.538 INFO    DCS: DCS/2.5.4.25729 (x86_64; Windows NT 10.0.17763) 
2018-12-20 16:33:05.561 INFO    DCS: Hwid: 2V5Nau7aFR3bUeALVQMidXSH1PS6Tx6Mq5KCyA 
2018-12-20 16:33:05.561 INFO    DCS: DCS revision: 145721 
2018-12-20 16:33:05.561 INFO    DCS: Renderer revision: 18383 
2018-12-20 16:33:05.561 INFO    DCS: Terrain revision: 18529 
2018-12-20 16:33:05.561 INFO    DCS: CPU cores: 4, threads: 8, System RAM: 16272 MB, Pagefile: 19872 MB 
2018-12-20 16:33:05.578 INFO    EDCORE: (dDispatcher)enterToState_:0 
2018-12-20 16:33:05.585 INFO    Dispatcher: 2018/12/20 10:33 V1803061700 
2018-12-20 16:33:05.600 INFO    INPUT: Device [Keyboard] created deviceId = -1 
2018-12-20 16:33:05.636 INFO    INPUT: Device [saitek Pro Flight X-55 Rhino Throttle {82C54820-F7C3-11e7-8002-444553540000}] created deviceId = -1 
2018-12-20 16:33:05.636 INFO    INPUT: Joystick created[saitek Pro Flight X-55 Rhino Throttle {82C54820-F7C3-11e7-8002-444553540000}], ForceFeedBack: no 
2018-12-20 16:33:05.637 INFO    INPUT: Device [saitek Pro Flight X-55 Rhino Stick {82C54820-F7C3-11e7-8003-444553540000}] created deviceId = -1 
2018-12-20 16:33:05.637 INFO    INPUT: Joystick created[saitek Pro Flight X-55 Rhino Stick {82C54820-F7C3-11e7-8003-444553540000}], ForceFeedBack: no 
2018-12-20 16:33:05.782 INFO    INPUT: Device [Mouse] created deviceId = -1 
2018-12-20 16:33:05.801 INFO    INPUT: Device [TrackIR] created deviceId = -1 
2018-12-20 16:33:05.823 INFO    SOUND: Using driver: xaudio29 
2018-12-20 16:33:05.846 INFO    SOUND: Found 3 available audio device(s): 
2018-12-20 16:33:05.846 INFO    SOUND:   0: ID: "\\?\SWD#MMDEVAPI#{0.0.0.00000000}.{6b4b0085-b586-4470-8b60-a0c50f4b4169}#{e6327cad-dcec-4949-ae8a-991e976a79d2}", Name: "4 - MP59G (AMD High Definition Audio Device)" 
2018-12-20 16:33:05.846 INFO    SOUND:   1: ID: "\\?\SWD#MMDEVAPI#{0.0.0.00000000}.{a3ba01b2-a725-485f-be12-b698d589d690}#{e6327cad-dcec-4949-ae8a-991e976a79d2}", Name: "Realtek Digital Output (Realtek High Definition Audio)" 
2018-12-20 16:33:05.846 INFO    SOUND:   2: ID: "\\?\SWD#MMDEVAPI#{0.0.0.00000000}.{1c4ccd3d-b400-4c8c-835c-42e5ada6608e}#{e6327cad-dcec-4949-ae8a-991e976a79d2}", Name: "Speaker/Headphone (Realtek High Definition Audio)" 
2018-12-20 16:33:06.020 INFO    SOUND: loaded 1313 sdefs from "sounds\sdef" 
2018-12-20 16:33:06.020 INFO    SOUNDER: Preloading Sounders from Sounds\Sounders 
2018-12-20 16:33:06.702 INFO    NET: Login success. 
2018-12-20 16:33:07.568 INFO    NET: Got auth data. 
2018-12-20 16:33:07.576 INFO    DCS: Successfully got authorization data. 
2018-12-20 16:33:07.582 INFO    Dispatcher: Loading installed modules... 
2018-12-20 16:33:09.289 INFO    Scripting: OBSOLETE mount_vfs_sound_path() used in ./CoreMods/aircraft/AJS37/entry.lua 
2018-12-20 16:33:09.376 INFO    Scripting: OBSOLETE mount_vfs_sound_path() used in ./Mods/aircraft/AJS37/entry.lua 
2018-12-20 16:33:09.390 ALERT   Dispatcher: Error running Scripts/Database/db_scan.lua: [string "./Scripts/Database/Weapons/aircraft_guns.lua"]:63: Unknown aircraft gun mount template: M_2_L1 
2018-12-20 16:33:09.390 INFO    DCS: application shutdown 
2018-12-20 16:33:09.394 INFO    SOUND: detaching sdef path "sounds\sdef" 
2018-12-20 16:33:09.683 WARNING EDOBJECTS: lTypeObjectManager::Create() doesn't exist. 
=== Log closed.   
Thanks in advance, DxDiag.txt