Could it be that the windows open off-screen? This can happen when you have multiple screens, and you open an file with not all screens present. I.e. at home you have an extra monitor attached to your laptop and now you're somewhere else with just the laptop.
If this is the case you can try 'Cascade Windows' or 'Tile Windows'.
Thanks for the input, did not change it.
If any one has the same issue. It went away when I restarted the computer, but no clue what it was.