IDE hangs on startup: "invalid path creating config dir"

The sample you provided does not provide sufficient information for me to verify my hypothesis, but the most likely cause is that you changed your macOS username since the time you first installed Arduino IDE.

Does the true name of the myMacBookProAccount folder in that error match exactly with your macOS username? I understand that you changed the name of the folder for anonymity. I am asking you to check the real name of the folder shown in the logs against your current macOS username.