Hmm, how you close your terraria? (through menu, Alt+F4, or exit button at top left)Unfortunately, when I close Terraria with this mod running, it seems to keep Terraria open in the background, and on Discord too.
I have to use task manager to close the background process, otherwise when I try to use Steam to open it, it says 'App already running' or something of the like. Hopefully this gets fixed soon
I might start to update this mod to 0.10.1.15 tModLoader and fixing other issues