KF2 stop launchinmg after setting change

Hello. I didn't played KF2 for a while and today I launched Killing Floor 2 and changed graphics settings to my regular (Ultra preset), then game asks me to perform game restart to apply my graphics settings. After this action game don't launch anymore.
I've tried to check game cache, remove config files (My Documents/My Games/KillingFloor2), reboot my PC. Nothing works.
Killing Floor 2 process running in Task Manager and Steam shows I'm playing KF2 (in my Steam profile).

Here is my log... Maybe it will be useful.

Log: Log file open, 06/28/15 18:47:43
Init: WinSock: version 1.1 (2.2), MaxSocks=32767, MaxUdp=65467
Log: ... running in INSTALLED mode
DevConfig: GConfig::Find has loaded file: ..\..\Engine\Config\ConsoleVariables.ini
Init: Version: 10897
Init: Epic Internal: 0
Init: Compiled (64-bit): May 26 2015 15:10:10
Init: Changelist: 1532151
Init: Command line: -nostartupmovies
Init: Base directory: D:\Games\Steam\steamapps\common\killingfloor2\Bina ries\Win64\
[0000.10] Init: Computer: EDGARPC
[0000.10] Init: User: Edgar
[0000.10] Init: CPU Page size=4096, Processors=4
[0000.10] Init: High frequency timer resolution =3.417971 MHz
[0000.10] Init: Memory total: Physical=7.9GB (8GB approx) Pagefile=13.4GB Virtual=131072.0GB
[0000.16] Log: Steam Client API initialized 1
[0000.16] Log: Automatically setting Steam query port to 27015 (server port is 7777)
[0000.16] Log: Automatically setting Steam port to 20560 (server port is 7777)
[0000.21] Log: Steam Game Server API initialized 1
[0000.21] DevOnline: appSteamInit: Steam Game Server UID: 0
[0000.21] Init: Presizing for 0 objects not considered by GC, pre-allocating 0 bytes.
[0000.21] Init: Object subsystem initialized
[0000.23] Log: CachePaths() took 0.02 Seconds
[0000.23] DevDataBase: Connection to "Provider=sqloledb;Data Source=production-db;Initial Catalog=EngineTaskPerf;Trusted_Connection=Yes;Conn ection Timeout=2" or "10.1.20.20" failed
[0000.25] Log: Unknown GPU : Nii 0x13c2

[0000.25] Log: Adapater : NVIDIA GeForce GTX 970

[0000.25] Log: Vendor : Nii

[0000.25] Log: DeviceId : 5058

[0000.25] Log: SubSysId : 829494370

[0000.25] Log: Revision : 161

[0000.25] Log: DedicatedVideoMemory : 4008 MiB

[0000.25] Log: DedicatedSystemMemory : 0 MiB

[0000.25] Log: SharedSystemMemory : 4065 MiB

[0000.25] Log: DisplayCount : 1

[0000.25] Log: "\\.\DISPLAY1" : { "x" : 0, "y" : 0, "width" : 1920, "height" : 1080 }

[0000.25] Log: [AppCompat] Machine detected compatibility level: Composite: 3. CPU: 4. GPU: 3.
[0000.25] Log: [AppCompat] Previous detected compatibility level: Composite: 3. CPU: 4. GPU: 3.
[0000.25] Log: Found D3D11 adapter 0: NVIDIA GeForce GTX 970
[0000.25] Log: Adapter has 4008MB of dedicated video memory, 0MB of dedicated system memory, and 4065MB of shared system memory
[0000.26] Log: Found D3D11 adapter 1: Microsoft Basic Render Driver
[0000.26] Log: Adapter has 0MB of dedicated video memory, 0MB of dedicated system memory, and 4065MB of shared system memory
[0000.27] Log: Shader platform (RHI): PC-D3D-SM5

KF2 stop launchinmg after setting change