I've tried everything I can think of but the game refuses to launch. I've reinstalled the game, tried the runtime reinstall fix, tried previous versions of the game (including old UI), removed all workshop content, tried the player json removal fix, unplugged game controllers, checked and tried different gfx settings in steam (launch rFactor 2 gfx config), verified files... nothing. I press play, few seconds later it goes back to "play". Had this problem for months. Any ideas on a fix would be much appreciated. Digging through forums seem to indicate that I am definitely not the only one suffering from this issue. The log file's last two lines: 2.03s Masfile.cpp 2581: Error opening MAS file coreshaders.mas 2.37s main.cpp 343: onFatalError 11 My system: Windows 10 x64 Intel(R) Core(TM) i7 CPU 950 @ 3.07GHz 3.07 GHz 18,0 GB RAM GeForce GTX 1060 6GB Driver version 516.94 The weird thing is that I have a dual boot system. The game works fine when I use Windows 7 x64 and it's the same computer so the hardware is exactly the same.