I still cannot reproduce this. In this entire thread there is only one .capx linked to (by —) which is not a minimal project, but I still can't reproduce it: the NWJS processes always close properly when I run the game and click the X in the corner. Is this specific to another way of closing the window, e.g. Alt+F4, or the Browser 'Close' action, or something else? There is very little I can do without demonstration .capxs as the bug report requirements mention, and 4 pages of "me too" doesn't help us get to the bottom of it either!