I have been trying everything I can to determine what is causing this black screen bug that occurs for just a small percentage of players.
Sadly, after testing the game on 6-7 different PCs, I haven't been able to replicate the bug. Trying to determine the cause without being able to replicate it is essentially like searching for a needle in a haystack.
All I know at this point is that it's related to running the game in fullscreen. For this reason, I have altered the game to open in windowed mode by default. This should prevent the bug from occuring for new players the first time that they open the game, but if they try to switch to fullscreen at any point, they may run into it, so this isn't an ideal solution.
I'm sorry that I can't fix it completely.