CPU Brand: Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz
Kernel Version: 4.14.65-1-MANJARO
Driver Version: 4.6.0 NVIDIA 396.51, Proton 3.7
I'm having the same issue. I mounted my Windows games partition and compared the files between the Windows install and this one, and everything matches up. Going to investigate some more.
Hello @twinsonian, we'll be using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue over to https://github.com/ValveSoftware/Proton/issues/466#issuecomment-415994810.
i5-4460 / RX 460
Proton 3.7 - Proton 3.7.4
Ubuntu 18.04 / Mesa 18.3.0-devel - padoka PPA
This affects Grim Dawn with or without ashes expansion.