Well, when I downloaded the game on my computer I didn't have this problem, so it's a mystery at the moment why it happens and strange that it happens only now and didn't happen before since there was no change in the menu in any of the updates, but, I can try to find out
Searching for problems like this online, the only forum I found is about someone having this problem because they play on a tablet and it's some incompatibility the old drivers have with Rpg maker, do you play on a laptop, desktop, tablet or anything else? Do you still have the 5th version saved or overwritten, if so, does it run normally? I'm really intrigued by this and I think it's a good idea to try to see how to solve it, which I had no idea could happen.