Nick

if

you have a laptop connected to two monitors with the laptop display closed and off

and

you open a raw file in adobe camera raw

and

you move the camera raw window to a monitor other than the one your source program (Bridge or Photoshop) is located

then

you have to make sure you move it back to the same window before closing the source program. ^{(Fig 1)}

because if you don't, the next time you open camera raw it will remember the x/y position of the camera raw window.

wait why is that a problem?

If you unplug your laptop from the monitors and try to use the laptop display (as I was attempting to do last night), the camera raw window will be in the off-screen X/Y position with no way to get it back. ^{(Fig 2)}

please enjoy my shitty diagram

This is not fixable by:

A. Reinstalling Bridge, Photoshop or Camera Raw

B. Trashing all preferences / configurations of any of the above

C. Changing display settings in your OS (Windows 10 in this case, but looks like it impacts macOS as well)

D. Any windows tricks to try to move the window via keyboard shortcuts or taskbar trickery because of the way camera raw’s window nests within the host app.

The only way to fix it was to connect an external monitor, move the damn window and close it.

you'll be shocked to learn that this was nowhere in the adobe community forums