Hi Brodie,
I don't have multiple displays but on another forum I saw this solution, I hope it helps (credits to "Gully Foyle")
@unknownuser said:
The way I get them back is by following this procedure. Do it for each missing browser, one at a time.
First, you want to give the browser focus, so you should select that browser from the Window menu, even if it already has a plus next to it (if it does, click it twice so it ends up with a plus and is the last thing selected. It should then have focus, even though you can't see it.
Then, you want to open its system menu using the keystroke Alt-Spacebar, then put it in Move mode by hitting M. At that point you should be able to scoot it around with the arrow keys. What you can do is to hit any arrow key once and then move your mouse back and forth, up and down, without pressing any mouse buttons. If all goes well, you should see the missing browser moving around with the mouse. Once the thing is back on-screen, click the left mouse button or hit Enter, and you should have it back.
Then proceed to the next missing window, and so on.
Gully Foyle