supermarket

@RXP I noticed that GTN Simulator.exe was being launched with a --configpath argument naming a sim_session.json file somewhere under %TMP%. The path wasn’t quoted, so anyone with spaces in %TMP% would run into trouble. %TMP%, by default, contains the username (normally, C:\Users\%USERNAME%\AppData\Local\Temp). It’s not uncommon to have spaces in usernames on Windows. Like I said, I already notified Garmin and told them how to fix it. But I also figured that a lot of people would hit this, and wanted to as many as I could know what my workaround was in case it helped them out.

Does your Windows user account name have a space in it, by chance? Could you try with an account whose name doesn’t have spaces in the name? Create a new account to try, don’t try to rename an existing one. I found a bug in the Garmin Trainer related to spaces in usernames and reported it to them. I saw that this seemed to be where people were actively complaining about black screen/blank screen/no power with the GTN Trainer, so I signed up here just to offer you all this suggestion.