Hello everyone,
Do these issues only occur with projects that you have converted from 4.16? Have you tried reproducing these issues in a fresh project? I’m not able to reproduce it locally from the currently provided information.
Also, are you all getting the exact same error? The error messages provided by wisemethuselah and Selentic seem to be different and could be caused by different issues. As for you, MADHOUSE, what error are you receiving? If you’re only getting a black screen, could it be that your map is not being loaded? Please ensure that your Maps & Modes are set to start on the correct map. Please provide the log file for the packaging process and the log file for the session itself where the black screen appears. There could be warnings or errors that can explain what is happening.