Posting only to state that I run Windows 8.1. Launchers crashed for me and CoherentUI was not running in Processes.
Shortcut command prompt fixed the issue temporarily, allowing me to return to game. Turning off automatic detection as per instructions of:
https://forum-en.gw2archive.eu/forum/support/tech/CoherentUI-Anti-Freeze
Solved the issue. Granted, launcher does not remember my password even when prompted to.
this specific thing they mentioned helped me fix mine but instead of turning off Automatically detect settings (because it was already off) for some reason my Use automatic configuration script was on so i turned it off and GW2 works again WOOT!