No, it should work instantly.
Do you know what it's actually saving? It's a hidden password field so you can't easily see what it's changing it to. Seeing what it's saving there would offer a clue to the probable cause.
It won't make any difference the install order. However try disabling all plugins except QuickFile and see if it works, at least then you can deduce that it's a plugin interfering with the value in that field.