This has probably been reported lots before but a number of updates to FM14 has gone past and it hasn't been fixed.
Any window (script workspace, calculation box etc.) will remember it's position when in a dual monitor setup, then when the monitor is removed the window is missing!!
I am on Windows 10.
This is what I often do - I develop at home on dual monitors, close filemaker, take my laptop away, I need to make a change or look something up and !!!!! I can't !!!!! I have to wait until I can hook up to a dual monitor so that I can move that window back.