The raster Subset window has suddenly stopped showing up. I believe it is some where behind the main window but I have no way of getting it forward. Thanks for a solution.
Could you share the details of your operating system, SNAP version and the actions you took before the window disappeared? Does this happen every time you run the Subset operator?
Is there any error in the log file? (Help menu → Show log directory → messages.log file → check its content after reproducing the problem)