I have the same problem and the solution described above doesn't work for me.
It seems to me like the configuration tool isn't saving the settings, as every time I launch the tool all the settings have been reset. This could explain why the solution doesn't work.
This pretty much explains your issue. Either the folder you're trying to save to isn't writable or you don't have the permissions. Also remember to clicks save, it doesn't autosave... I think.