The modules rely on each registrars whois template method being kept up to date, and NSI slightly changed their format recently. If you're using this module in production stuff, you might want to join up to the mailing list, you'll occassionally see people mentioning updates, and you can submit any of the changes you make to help everyone keep it working (I'm working on methods for some of the registrars not currently covered, as are several other people)

the hatter