so i just had this same problem for the last 20 minutes! Place Order button was below my screen!!! here's how i solved it: I right clicked on the top gray bar (where it has the name of your file and all the little icons), and it gives you the option of "icon and text" or "icon only". I selected "icon only". This made the top bar shorter, which brings the screen up high enough to click the Place Order button!
I'm sure there's an easier way but this was what worked for me!
