Tree of Savior (steam) - December 2018
Additional Details:
This is actually an old issue related to the steam app. Previously, for the instances with no active steam running, they can switch maps normally and only crash when changing characters (since the game probably checks for steam on the character selection screen). Now in the most recent ToS version, the same crash is now happening when changing maps/channels, but unfortunately I do not know when this started since it's been a long time since I multiboxed.
If there's a way to somehow run multiple instances of steam for each ToS.exe, without having to do "end task" on steam.exe each time, that would make multiboxing with ToS much much easier and less frustrating. Please help.