It doesn't need to be on a remote machine.
My setup is laptop + dock (Those so called "Dock" Dell Display Link that you plug with USB 3...) . Due to its size, laptop screen is setup with higher DPI than the other - regular 27 inches screen. (Causing a window you move from one screen to another to resize)
Today my dock did crash - PL/SQL developer was open and was maximized on my middle (27") screen. Due to the dock crash, I have to unplug/replug it. it cause display to resync, disabling the extra screens, and so moving automatically all windows to the main, laptop screen.
As a result, PL/SQL Developer also resized as it get forcefully moved to the laptop screen... And loose the overall interface, including title bar, minimize button, close button and everything. Only the open "tabs" (Single Document mode) stands in the middle. Everything else is grey.
Seems that is happen regardless the reason the windows get forcefully resized. Remote or laptop screen switch. I would suspect that a resolution change over a maximized windows would have a similar effect.
Windows 8.1 64 bits, and PL/SQL Developer 12.0.1.1814 also 64 bits, for my config.
Last edited by Nicolas D.; 03/07/17 09:46 PM.