Incase anyone wanted to fix the VPGrid not full error, I added this line to my script.rpy file
define config.allow_underfull_grids = True
Your fix for the "VPGrid Not Full" error seems to work, DaFlyinHawYn! At least for the current 8.1.1 Ren'Py release.
Thank you so much!
I found another small error on line 89 of the all-messages.rpy file. You have to swap out MC for player_name or the included example game will crash.
Thanks again! Be well!