Windows save

[Jukken]

I have three monitors and a TV connected to my PC.
TV is usally turned off.

Gimp is on one of the monitors.

I go to Save As or Export As in gimp. 
The pop-up where I put in name for the file is nowhere to be seen. Nothing.

Then I turn on the TV - and there it is. Extremly frustrating.
I drag the save-window to the correct monitor.

I then go to Preferences and go to Window management - Save Window Positions Now.

ok, all good - so I thought.

Shut down Gimp and restart program.
Try and save again - and the **** save-window tops up on my friggin TV (that is shut off). 

How do I actually save EVERY gimp-window on the correct monitor?

[Ofnuts]

Can't tell for Windows, but on Linux, dialogs seem to open on whatever is the "main" monitor (which in my case is the laptop display)