I don't see anything wrong in your log, other than you said it happened at KEWR ( you don't say it, but I guess you mean DD KEWR ? ), which wasn't supported before the latest update. However, this would only result in jetways not being detected, not GSX failing to start.
However, your log indicated you were at KDTW instead, and you loaded the airport, then came back to the Main menu without doing anything, then exited the simulator. Nothing there showing GSX didn't start.