Polymost: Hitting the Apply Changes button will briefly display odd tiles in place of the menu letters

When in Polymost, hitting the Apply Changes button, for instance to change the FPS limit, will very briefly display blank or even strange garbage tiledata in place of the menu letters and the cursor: (here tested in Alien Armageddon)

Sometimes this flashes by too quickly to be noticed, and othertimes it ends up being quite noticeable.