Andre van Zuydam

So, in order to get the window back, hold mouse on task bar icon of minecraft, when the preview appears, right click and choose maximize, you will then get the window - drag it back into the screen

I'm glad someone else gets this, I had to make a new user account on my windows OS just to get the launcher, also trying to push the launcher to a different virtual desktop doesn't work either. So plugging in a screen again and moving the launcher back to the correct desktop solved this. Incidentally this is not an issue on MacOS, the new launcher correctly re-initialises on the primary screen if screens are disconnected.

This is happening to me on latest minecraft 1.11.2, I have opened another ticket.