Check the intro's events and find the event that start it. Set it as auto start event. If this doesn't work then put some axes on the player start point that triggers on death the event that start everything. This should make sure the intro will start.
bossedit8 wrote:Where's the original hub level and the .wld data placed inside the SMBX Episode? Usually the .wld needs to be inside the SMBX Episode in order to read it ingame.
This can't really be the solution, because he can get to the intro just fine.