A clean install always help.
But you also must make sure you actually delete the game completely from the computer, otherwise it might bump into the same issue again.
If the character came "back" from a map you made it doesn't really matter to cape, because cape automatically places everyone on the same spot unless there's issues collecting position data, you do not even have to enter coordinates of where you will come back in cape, just where you will get placed on your way into your map.
There's just 1 way to get back to the working cape, and that is via the portal that is created when you use "Has portal" function in the map maker. Any other way is faulty as far as I know.