I find this a highly annoying "feature" on a wide screen monitor that my mostly used apps - terminal and gedit always open directly under the top-left corner of my screen and I have to drag them to my eye position each and every-time.
I have tried installing the CompizConfig Settings Manager and using the feature to position windows centre, but this has had no effect - the force feature here isn't working for me either:
Window Management -> "place windows" -> Fixed Window Placement -> Windows with fixed positions example: gedit 200 200 keep-in-work-area-to-yes
I can use e.g. gnome-terminal --geometry=140x50+50+50 for the terminal but this doesn't work for gedit.