Resizing the window when there is no post process means the views aspect ratio gets updated when the engine.resize() function is used. However resizing the window while a postprocess is enabled means the view gets stretched even while the engine.resize() function is running. The "engine.resize()" function still updates the resolution if there is a post process, since there are no stretched or blurry pixels, it's just the aspect ratio that doesn't change. Everything works if the window is resized