Hmmm... Did the game turn into a scroller view after you have finished the cutscene?
After talking to Timoty, it's all black for me too.3 years ago (+3)
Problem Solved. Apparently, I was using Java 8 update 251 and it was not up to date. Then I updated it to Java 8 update 271, and it worked fine, no more black screen after speaking to Timothy.