Mumble Overlay Causing Game To Crash
mumble_ol.dll is known to cause the game to crash, not sure if there is a work around at this point, might need to wait for updates.
It’s not exactly secure, but you need to modify your GW2 shortcut -
Target should be
"X:\Path\To\Guild Wars 2\Gw2.exe" -password <yourpassword> -email <youremail> -nopatchui
You may want to keep a normal shortcut around for patching.
This works for my guildmates and I.
If you aren’t comfortable putting your password into a shortcut, then there’s currently no way to get the overlay working for you. You can just add gw2 to the blacklist in mumble’s settings to prevent it from crashing.