Okay so I've solved the problem!!Have you tried to put aphrodisiac on Maria's food if you finished her quests ?
cuz it happened to me as well when I tried to put aphrodisiac in her food it was getting a black screen too
And if you haven't finished Maria's quests which character quest you started before this happens
As you've mentioned earlier about the Aphrodosiac thingy. I've found the switch in RPGMaker and shut it off and WOLA.. It did actually worked. The White arrow in the kitchen reapeared and I could sleap again at 19:00-05:00
Thanks really for the help "Ketsura" for pointing it out in the first place!
Big regards really