Possible point of interest for the dev debugging this:
Happens to me as well, but interestingly only when I run the client in a sandbox (I don't like giving programs full access to my hard drive, I've had ransomware and buggy installers that try to delete my home directory far too many times to trust anything). No crash prompts, no error message, no screen flashing, the .exe launches and simply exits less than a second later. Deleting Local.dat does nothing. The issue started happening immediately after my client restarted ("New build available. Your game will restart in ...") and downloaded the latest build, so it's caused by something that just got introduced.
Windows 7 x64, AMD RX 560
