Well, without any information regarding map server errors or such I can't help you. =/
Sorry, I'm currently inactive because I don't have that much time on my hands. I'll add it to my todo list, but I haven't done anything scripting related in months. =/ If someone else wants to edit my script I wouldn't mind, though.
The command
@bankadmin interest 0
should do the trick.
Well that was just an suggestion make it whenever you want to make that thing