Seems like a common RPG Maker MV video driver related issue, try placing this file in the game's folder and tell me if it works.
https://cristianadam.eu/assets/grim-fandango/mesa_10_5_5_opengl32_pgo.zip
Source: https://www.reddit.com/r/RPGMaker/comments/3pza7l/fix_for_the_white_screen_issue...