January 2017
January 2017
What do you mean by "does not use the Steam overlay at all"?
Did you disabled the Steam overly for ME? If not it is still active and could be the reason for this error.
Furthermore, if you have a mouse trail enabled, disable it
December 2017
Just in case anyone ends up here after googling.
Go to settings / input and set mouse hardware to 'YES'.
You might have to reboot the game.
But this solved the problem for me using non-origin version of mass effec.