I keep getting the error No Map selected on my custom MBTA route.. I merged it with another route and then deleted the "Driver" part of it.. but I kept the actually route but now it's not showing up.
If the route/session is in TRS2006+, use Content Manager to check whether it is open for edit (there is a tab for this in Content Manager) - if any show up, select them then use Ctrl+M on the keyboard to commit them.