When changing resolution in script on Standalone, Windows does not clear the frame buffer. Thus,when aspect ratio changes, you will see what was last rendered in the areas of the screen that are no longer rendered.

To reproduce this:

1. Open the attached project
2. Open 'Test' scene
3. It has a few buttons which change resolution when clicking.
4. Build&Run on Windows Standalone
5. Click buttons to change resolutions
6. Note the sides of the screen not rendering and the leftover image of what was last rendered