i install the game/mod/plug-in, then i play with it in game, then when i'm done i go and click save and quite, then i can't relaunch the game? did i mess something up?
It sounds like the process might be hanging. You can check for Archipelagates in task manager and manually end the process if it is still there. Otherwise, I'm not sure why the game wouldn't start again. I haven't encountered this issue myself and haven't had anyone else report it.